In New York
At Dr. Rockwell's Lab
Donnie unlocks the door with his tool named Digital Lock Pick and the door opens. "There isn't an electronic lock out there my digital lock pick can't crack." Donnie said to Cheyenne who looks at the tool. "Nices I think I need to make one of these." Cheyenne said to him as she walks into the lab while Donnie giggled. Cheyenne and Donnie carefully sneak into Dr. Rockwell's lab and find the place an empty wreck. "Wow, this place is a wreck." Donnie said to Cheyenne who looks at the cages. "Ugh, he must have been experimenting on animals." Cheyenne said to him while Donnie sees a chair that looks like a dentist's chair. "Either someone was up to some secret research, or they were renting space to one freaky dentist." Donnie said to her making Cheyenne look at the chair. The two turtles walk over to the desk and Donnie looks through the desk's cupboards while Cheyenne looks at the papers. Donnie opens a secret door at the desk and it was mutagen and Cheyenne picks the mutagen up. "Mutagen..." Donnie said as Cheyenne looks a man from behind Donnie with a golf club walking over to Donnie. "Donnie, look out!" Cheyenne yelled and Donnie easily pins the man down. Cheyenne then turns on a nearby light, revealing that the man is none other than Dr. Falco. "Dr. Falco." Cheyenne said as she walks over to the two. Falco looks at the two and he screams after realizing they were on humans. "What are you?!" Falco yelled at the two. "Relax. I'm not gonna hurt you." Donnie said to him. "You already hurt me!" Falco yelled at him and Donnie gets off of Falco. "I mean any more." Donnie said to him. "We're here to help." Cheyenne said to him as Donnie helps him up. Cheyenne and Donnie ask Falco if he knows anything about April's dad. "I'm sorry. I wish I knew something about him, but I don't." Falco said to them. "So what can you tell us about this?" Cheyenne asks him pointing at the Mutagen. "Some shady corporate goon paid Rockwell a lot of money to experiment with it." Falco said to him. "The Kraang." Donnie said to them. "Well, I wanted no part of that stuff. Who knows what kind of monstrosities could result? No offense." Falco said to them. "Some taken." Donnie said to him. "Is that what was in that cage over there? One of his monstrosities?" Cheyenne asks him pointing at the cage. "Can we ease up on the m-word, please?" Donnie said to the two who look at him. "That's where he kept the monkey he was experimenting on." Falco said to them. "Whoa. It sure didn't like being locked up in there." Donnie said to him while looking at the cage. "Rockwell didn't treat it very well." Falco said to them. "Maybe the Kraang didn't take Rockwell. Maybe the monkey went berserk, busted out of the cage, and dragged him off or worse." Cheyenne said to Donnie who looks at her.
Back outside, Cheyenne and Donnie walk back to the sewers but they run into April and the two tell her what they know. "So how do you suppose we're gonna find Rockwell without any leads?" April asks the two. "Well, maybe we'll know more once we have a look at his flash drive." Donnie said to them as the three walked into an alleyway. "What flash drive?" Cheyenne asks him and Donnie then shows the two a flash drive. "The one I swiped off his desk." Donnie said to the two. "Nice!" April said to him and Donnie moves closer to Cheyenne. "Yeah. Well, keeping cool under pressure is the hallmark of a-" Donnie said to them suddenly, that very mutant monkey ambushes them. Donnie and Cheyenne take out their Bo Staff ready to fight it. "Careful, that's a dangerous mutant!" April yelled at the two. "That makes three of us!" Donnie yelled and Donnie tries to hit a monkey, but a monkey hits him away making Donnie drop his Bo Staff. "Donnie, are you okay?" Cheyenne asks him making Donnie look at her. "I'm good, just stay with April." Donnie said to her and attack the monkey again but it jumps out of the way. Donnie fights it, but he is no match for its random, mindless attacks. "Monkey! Oh, okay! Whoo!" Donnie yelled as the Monkey moves away from Donnie. "Donnie?" April calls him making Donnie look at the two. "I was just figuring out his timing. He is gonna regret that!" Donnie yelled and the Monkey hits him. "Ow! That- that, too! And that!" Donnie said while the Monkey hits him. "Got a lot of regrets, monkey!" Donnie yelled at the monkey as the monkey kicks him down. "Hey, come on! Hey, ow!" Donnie yelled as the monkey hits Donnie a few more times. The monkey throws Donnie away to the ground, injuring him. Then it comes to April and Cheyenne the two look at it as it was walking over to them. Before Cheyenne can attack it the monkey hits her into a wall and then it goes after a quite scared and defenseless April. It grabs her by the shoulders and roars at her, but it stops short of harming her. Cheyenne watches the two while April then sees that the monkey looks scared as well. "It's okay. Everything's going to be all right." April said to it and the monkey releases her. "What? What is it?" April asks it and the monkey roars one minute before it takes to the roofs. Cheyenne runs over to Donnie. "Donnie, are you hurt?" Cheyenne asks him making Donnie take hold of her hand. "Just my pride. And my internal organs." Donnie said to her and Cheyenne looks at April thinking she will be a problem in the future for her and her sisters.