Cas Apocalyptic Series - Tumblr Posts

Happy Anniversary Cass!!! 😭 On this date in history you created an amazing comic that is now one of the highlights of Tumblr. You are an awesome person and such a good member of this community. Watching your comic on YouTube was what led me to creating an account on Tumblr, and I just want to say thank you for that! (I’m going to ramble about my drawing for a bit) Donnie is taking a selfie, btw. I knew I was bad at drawing people (sorry Casey) but I didn’t know I was bad at drawing Raph. I had to stop myself from doing more of those glowing swirly magic things around Mikey. Raph is either waaaaaay far in the background or the banner is up super high, whatever looks best to you, lol. Anyways, happy anniversary :)

Okay, this is a crossover based off of @somerandomdudelmao’s Marble Sky and CAS series. While I was reading this post I was like “they should have a crossover” and this came to me like a month later while I was sleeping. If Ecliptica seems off it’s because I wanted to write some protective Uncle Tello and Casey Junior scenes. … IT WAS FUN OKAY. This takes place around the latest Marble Sky update (as of 6-18-2024).

Oscar had been talking to Ecliptica, just having a little chat, like what they used to do. Oscar had to slip away from Ward and Holly to do this. He was trying to get information without being too suspicious, while trying not to give away information. You know, classic spy stuff. Alcor was with them too, snoozing away in Oscar’s lap.

“So~” Oscar said, stroking the fur on Alcor’s head. “I was thinking—”

“My Moon?” a voice interrupted him. It was another Marmor. He looked nervous, his tail flicking. 

Ecliptica tilted her head towards him, an annoyed look on her face. “Yes, yes, what is it?”

The other Marmor gulped. “There’s a bit of a… situation in Lab B. We were testing the multi-dimensional portal machine the scientists have been working on.” He was fiddling with his tail now. “There was a purple flash, and an unknown alien species appeared out of nowhere.” He glanced in Oscar’s direction. “There is a human with it. The unknown alien is particularly aggressive and protective of the human. We are trying to detain it, but we need your help, my Moon.”

Ecliptica stood up, staring at the wall for a few moments. She was probably using her echolocation thing. An explosion suddenly rang out, causing Alcor to scramble out of Oscar’s lap in surprise. She straightened. “Let’s go.”

“Another human?” Oscar butted in, running up to her side. “Can I come? Maybe I can help calm them down.” He needed to see if this new person could be an ally, and maybe stop the Marmors from eating them if Ecliptica decided to.

She glanced at him, a small smile on her face. “Okay. I’ll protect you.” She started walking towards the direction of the explosion. Oscar followed her and the other Marmor, hiding a grin of his own. I’m not that one that needs protection, Ecliptica… I’ll stop you soon enough.

———————————————————————

First of all, this was not Donnie’s fault. Sure, maybe the time portal needed a few adjustments, but it wasn’t capable of something of this scale! He had programmed it to travel through time powered by Hamato ninpo. Not to travel to a weird alien (why did it have to be aliens) spaceship floating in the middle of fucking SPACE! And he hadn’t been expecting to accidentally take Casey Junior, of all people, with him. 

He did a supply check. He was wearing his goggles, but not his battle shell. He quickly made one with his ninpo and put it on. Battle shell over a t-shirt was not a good idea, but he’d have to push through the discomfort for now. After surveying the room, and taking note of the ten aliens in the room with him (six looked like nerds while four actually looked dangerous, but more would likely be on the way soon), he put an arm in front of Casey, blocking him and moving in front of him protectively. “Stay back, Casey.”

“Uncle Tello?” Casey whispered, grabbing his arm. “Where are we?”

“That’s what I’m trying to figure out,” he murmured. “But stay next to me; they might be hostile.” Casey’s grip tightened.

Donnie cleared his throat, spreading his hands and holding them up. “Good evening, gentlemen, and ladies, it seems there was a miscalculation in my time portal. We come in peace.”

The aliens finally reacted. The four that looked dangerous held up their shields and drew their swords. Well, to be honest, the swords looked more like glow-in-the-dark cattle prods. Five others started panicking, while the one closer to him was examining him curiously. Donnie didn’t like that feeling. A smile spread across the alien’s face as he noticed Casey. Oh, Donnie definitely did not like that. He let out a threatening hiss as the curious alien came closer, still eyeing his nephew. Well, the ‘eyes’ didn’t exactly look like eyes. Instead, they looked like black holes on their faces. He put that away for later. For the sake of simplicity, he would keep calling them eyes for now.

The alien scrambled back, ducking behind one of the armed guards and darting out the door. Greeeeaaaat. “Sorry about that,” Donnie said, trying to salvage the situation. “I like my personal space. Do you speak English?”

One of the guards stepped forward. “Yes, creature.” He motioned to the other guards, who moved forward with him. “Surrender, or we will alert our Moon.” He licked his lips. “And we might not eat you.” 

Donnie stiffened. “Yeah, not a big fan of the getting eaten part. So, ah, no. Not surrendering. But I’m sure we could work out a deal?” He wasn’t as adept at smooth talking as Leo, but no one could outsmart him. 

“… No,” the alien purred. “Surrender, now.” 

A smile tugged at Donnie’s lips. “Ah, okay. We’re doing it the hard way it seems.” He imagined blueprints in his head, feeling metal build upon metal and gears click into place. He summoned a barrage of mystical guns and missile launchers. The shock on the head alien’s face was very satisfying. “Now, stay back, and let me talk to whoever is in charge here. Your ‘Moon’ I’m guessing?”

The alien snarled, taking a few more steps forward, jabbing his cattle prod. This one is brave, or just very stupid. Probably the latter. “We will not surrender in our own ship. Besides, you won’t scare us with your fake light show.” 

“You aliens always ask for it,” Donnie snarled, thinking of the stupid air of superiority the Krang carried. Well, who’s on top now you pink bastards! I won’t allow my family to be pushed around by aliens ever again. He unleashed one of the triggers, causing an explosion (by the entrance wall of course, he did not desire to get sucked into space, thank you very much). “Was that fake?” 

In the silence that followed, someone pulled a lever, chasing the room to turn blue as an alarm blared. He glanced down, making sure that Casey was still next to him. He was, looking out at the aliens with wide eyes.

The foolish alien bared his teeth at Donnie. “Our Moon will be here soon.” The softshell didn't miss the nervous tremble in his voice.

He shrugged. “Whatever, then maybe I’ll be able to have a conversation with someone civilized.” Casey snickered.

A few more moments of tense silence stretched out. That was, until, another alien ducked under the broken entrance and entered the room. The scientist that had run out of the room followed her. Donnie’s eyes widened as a human followed the aliens. 

He then switched his attention to the first alien that had entered. She was tall, taller than Donnie and all the other aliens in the room. This made him feel a bit anxious, because Raph and the Krang were usually the only ones that were bigger than him. “Hello,” the alien rumbled. “My name is Ecliptica, and you are on my ship. Don’t worry, we won’t eat you. For now…” That sent a shiver down his spine. He noticed the other human staring at Casey. He pulled his nephew closer. 

“Like I was explaining to your colleagues,” Donnie started. The other human’s eyes lit up with surprise. “I was building a time machine, and there was a mishap. I didn’t expect this to happen.” He glanced at the other human, who was still staring at him. “What kid, never seen a mutant before? I’m assuming you are also from planet Earth? Unless it’s called something else in this fucking dimension.” 

Ecliptica drew up to her full height. “Now, no need to be feisty.” She glanced at the human beside her. “Give us your human pet, and we might spare your life.” He felt Casey press harder against him.

“Don’t fucking touch him,” Donnie snarled, his markings lighting up as he added more firepower to his display. “And he’s not my pet.” 

The other human stepped forward, opening his mouth like he was about to say something, but was stopped by Ecliptica. She put a hand on his shoulder and knelt down, whispering something in his ear. She stood up, looking at him. “Not your pet? Then what is he? One of your slaves?” 

Anger boiled in his chest. “No! And it’s none of your business.” If he told him that Casey was his nephew, they would just use him as leverage. 

“Fine,” Ecliptica replied, holding up a clawed hand. “Then die.” 

“Wait!” Donnie’s stomach tightened as Casey ducked out of his grip and approached Ecliptica. “Don’t. I’ll come with you.” 

“Casey Junior!” Donnie yelped, his heart pounding. He hadn’t gone through literal hell and back just to lose Casey now. “Get back here right now, young man. Leo would kill me if anything happened to you.” He stared into Casey’s eyes. “I’m not losing you to aliens again.” It was probably not the best idea to expose his emotional trauma to everyone. 

Casey’s eyes shimmered. “Don’t worry, Uncle Tello. I can take care of myself.” 

Before Donnie could make another move, the other human came forward. “Woah, everybody chill.” He put a hand on Casey’s shoulder, prompting a low hiss from Donnie. Ecliptica snarled back. “My name is Oscar, resident human assistant/ambassador, I guess.” He turned to Ecliptica. “Anyways, let’s maybe not eat them for now? They could be useful.” Oscar smiled at Donnie. “This one’s probably super smart, based on the flashy display and oversized forehead. Also, look at that gear. Total brainiac. Besides, you let me, Ward, and Holly hang around, what’s two more?”

Donnie narrowed his eyes. “Scoff. Even if your flattery is weirdly accurate and truthful, nothing will be discussed until you give me back Casey.” 

“Silly, alien,” Ecliptica tsked. “I will decide that. But… yes. You will stay with us for the time being. Until we decide what to do with you. Now, put away your weapons.” She leaned forward. “Though, I am curious on how it works.” 

He crossed his arms. “First, Casey Junior. And our confirmed safety.” 

He didn’t miss the twitch on Ecliptica’s face. It probably wasn’t the best idea to be acting and talking like this to their leader, but being subtle wasn’t one of his strong suits. “Yes, little alien, you can have your human back. And we won’t harm you.” There was a silent ‘for now’ following her words. If there was anything Donnie had learned, it was that aliens could not be trusted. 

“Please stop calling me ‘little alien,’” Donnie said, his weapons disintegrating. “My name is Donatello. Donatello Hamato.” He walked towards Casey, keeping an eye on Ecliptica. “Thank you. Where can we stay?” 

“You bros can bunk with me!” Oscar offered. “If that’s okay.” 

“Yes,” Ecliptica answered, her tail flicking. “But, if you do anything Donatello, we will know.” She gave him a smile full of sharp teeth. “And it won’t end well for you.” 

He waved his hand. “Yeah, yeah, we get it. You’re menacing.” He turned to Oscar before he could see Ecliptica’s expression. “Now, show us the way!” 

Donnie kept a firm grip on Casey’s shoulder as Oscar led them down the hall. 

———————————————————————

“Oke doke,” Oscar said as they stopped in front of a door. “Soooo, I have two roommates, but don’t worry! We have extra beds and they won’t try to eat you. Well, physically at least. Ward might try to eat you emotionally~ He’s such a downer.” 

Donnie raised an eyebrow. “Uh, okay. By the way, are you spying on us for the rest of the aliens?” 

Oscar leaned forward, his voice dropping to a whisper. “No. In fact, I’m far from it. I’ll explain more when we get in the room.” Donnie nodded in return. 

Casey shuffled his feet. “Is Ward a human too?” 

“Yep!” Oscar replied. “Ward is human, but Holly’s an alien.” A scowl immediately hit Donnie’s face. Oscar glanced at him. “Don’t worry, Holly’s super nice and peaceful. He’s only here because the Marmors destroyed his planet.” 

“Marmors?” Donnie asked. “Are they what Ecliptica and the rest of those aliens are called?” 

Oscar nodded. “Interesting,” Donnie murmured. “Anyways, I would like to get out of eyesight of the Marmors. If those are eyes on their faces.” 

“Well, those aren’t eyes,” Oscar said. “They’re more like holes in their faces. They use it for echolocation or something like that. Also, Holly explained it to me, but they have this hive mind thing where they all see what each other see.” He shrugged. “So they can’t hear us, but they can see what we’re doing.”

“Shit,” Donnie cursed. “Well, that’s great, he said sarcastically.” He hated hive minds. Too creepy and close to the Krang. 

Oscar chuckled. “I like you! Anyways, let me go and explain the situation.” He tapped the panel on the side and the door slid open. He practically burst into the room. “WARD, HOLLY, WE HAVE NEW ROOMMATES!!!”

There was a thunk and a yell of pain. A middle aged looking guy appeared, a grumpy frown on his face. “Seriously, Oscar? You made me fall off the bunk bed.” 

“That sounds like a you problem,” Oscar said, flipping his tied up hair. “Besiiides, we have new roommates! And guess what? They’re both from earth from a different dimension!” He stepped aside and gestured to them. “Come inside. We don’t bite~”

Donnie rolled his eyes, slightly ducking through the doorway and entering the room, glancing back at Casey as he followed him.

The guy’s eyes widened. “Oscar, I thought you said they were from earth? This one looks like an alien.” 

“I'm not a fucking alien,” Donnie explained again through gritted teeth. “I am a mutant turtle. There’s a big difference.” 

“Ward?” someone called. Another guy entered the room, except this one was wearing some kind of armor, had purple hair, and had an eyepatch. It painfully reminded Donnie of Raph. “Did you hear that explosion…” His voice trailed off as he noticed Donnie and Casey. His eyes brightened. “Hello! My name’s Holly. Can I touch you?” 

“Hi, Holly. No.”

The alien smiled gently. “Please. I promise I won’t hurt you.” 

“Sigh,” Donnie said, holding out his arm. “Go ahead.” 

“Did you tell him?” Donnie heard Ward mutter. 

“No, why?” Oscar responded.

Casey turned to them, his voice angry. “Tell him what?”

“Cas—” Donnie started to say, but was cut off by a flash of soft, purple light. The softshell turned around, his breath catching in his throat. 

In Holly’s place… was another mutant turtle. He was wearing the same clothes as Holly, including the eye patch. He was as tall as Donnie, but without the goggles. There was a lavender colored stripe running from his lower lip, along his throat, and disappearing into the color of his shirt. Looks like a Blanding’s turtle, his tired brain supplied. 

“Great,” Donnie grumbled, his voice dripping with sarcasm. “He can shapeshift. Awesome.” 

Holly inspected his new form, eyes wide with curiosity. “This is cool. I feel strong.” 

“Yeah, that’ll be the super soldier genetics,” Donnie said. 

“Super soldier?” Ward’s voice was shrill with disbelief. 

Donnie closed his eyes, pinching the bridge of his beak. “Is now really the time for my origin story? Of course it is. Me and my brothers were mutated by a warring warrior scientist to destroy humanity. Don’t worry, our dad got to us before that could happen,” he added, imagining the looks on Ward and Oscar’s faces. He clapped his hands. “Anyways, my name is Donatello. But call me Donnie. I’ve had enough of being called Master Donatello in the last twenty something years to last me a lifetime.” 

“Hi,” Casey said, holding out his hand. “My name is Casey Jones Junior. You can call me Casey or CJ.” 

Instead of grabbing his hand and shaking it, Holly excitedly shook his hand around. “Shaking hands is fun!” There was a flash and he turned back into his human form. 

“So, how does the shapeshifting work?” Casey asked, staring up at Holly’s face.

Holly smiled. “Well you see. I have to be touching the creature and—”

Donnie started tuning out the conversation, but paying attention. He was also curious, but he wanted to talk to Ward and Oscar.

Oscar was way too much like Leo for Donnie’s liking, the last thing he needed was a dumb-dumb that always smooth-talks his way into trouble. It was also making him slightly homesick but that doesn’t matter right now! What matters is finding a way off this spaceship and back to his own dimension. 

Ward seemed… eternally tired. He might even have a bigger Raph chasm than, well, Raph! Now that was alarming. The softshell also didn’t miss how jumpy he seemed. Donnie flashed him a smile. “Sooo, first time?” 

Ward gave him a wary glance. “W-what?”

“Y’know. First time dealing with murderous aliens?” 

“Um,” Ward said, a confused look in his eyes. “No! Why? Have you done this more than once?!”

“Eh,” Donnie replied, waving his hand vaguely. “Not exactly. In my dimension, the Krang took over the world and basically killed everyone. Casey went back in time and, with my help, brought us all back to life.” Ward looked confused and alarmed now. 

“So~” Oscar said, shoving Ward away in the face. “Is Casey your nephew? You said you had brothers. Is he Leo’s son?” 

“Yes, but it’s more of an adopted family situation,” Donnie explained. “His mother was one of our best friends. So when she died, we decided to take care of him.” He could hear the nostalgia in his words. Damn, he sounded old. “Leo’s always been more of a father figure, while the rest of us have been more of cool uncles. I have three brothers, and one sister. Leonardo is my twin. Raphael is my oldest brother, and Michelangelo is my youngest. April is like a sister to us.” 

Oscar smirked. “Ah, all renaissance artists huh?” 

“I’m surprised you know who those people are,” Ward grumbled, nudging him. 

“Whaaaaat,” Oscar said. “I know stuff! My family has a lot of art from them.” 

Ward rolled his eyes. “Of course.” Okay, Donnie liked Ward. 

Donnie felt someone tug on his shirt. “Uncle Tello?”

He turned around. “Casey Junior?” 

Donnie bent down as Casey reached up. “I asked Holly,” his nephew whispered. “He said there is an alien species called the Krang.” A shiver ran down the softshell’s spine. “But the Marmors killed them off. I described the Krang to Holly, and he said that this version was a tiny, peaceful race.” 

“Huh,” Donnie said, pulling away. “Well, at least they don’t exist anymore. Although, I’ll believe it when I see it. Also, Casey, about that stunt you pulled earlier…” He glared at his nephew, who shrank under his gaze. “WHAT THE FUCK WERE YOU THINKING! DON’T YOU DO THAT AGAIN, MISTER! OR YOU WILL BE GROUNDED. And that’s not a threat, it’s a promise.” Donnie patted him on the head. “You almost gave me a heart attack! Just don’t do that again.” 

Casey rubbed the back of his head. “Yes, Master Donatello.” 

Oscar moved in front of him. “Sorry to interrupt the lecture, but can you do magic? Based on your light display earlier, you seem pretty powerful.” He gave Casey a wink. 

“Don’t try to distract me,” Donnie growled. “And it’s not magic. It’s my Hamato ninpo, passed down through generations of the Hamato Clan. And I’m assuming you are asking because you want our help getting out of here.”

Oscar put a finger to his lips. “Lower your voice, but yes. We’re actually working to bring down the Marmors.” He threw his arms out. “We can discuss this in the morning! For now, let’s get some sleep! Feel free to take any of the empty beds.”

The softshell just nodded, feeling too tired to respond. The situation was starting to sink in. Casey took his hand and led him to the next room, where there were more beds. “I claim top!” 

Donnie took off his battle shell and flopped down on the bottom bed, letting out a deep sigh. 

“Uncle Tello?” Casey questioned, looking at him upside down. 

Donnie turned his head to look at him. “Yes, Casey Junior?”

His response was quiet. “How are we going to get back home? Everyone’s probably worried.”

“… I don’t know, Casey. I don’t know. But we’ll figure something out, we always do.” 

_________________________________________

The end! I couldn’t think of a good enough plot so that’s it, sorry. I hope you enjoyed it!!!

🫢🤯🥹

This…this literally blew me away like…I have no words to express how beautiful this is…

I Want Something Just Like This

Collaboration with the lovely @tapakah0 thanks for working with me ｡(TヮT)ﾟ｡

@somerandomdudelmao hope you feel better soon Cass ( -_-)＼(0-0 )

Song: Something Just Like This by Coldplay and The Chainsmokers