Disclaimer: I do not own "Teenage Mutant Ninja Turtles". The franchise is property of Nickelodeon studios. If I did own the franchise, I probably would have given the 2012 version have had at least one or two more seasons.

Author's Note: For some reason, I started wonder what "Mutagen Man Unleashed" would have been like if Timothy had wanted to kill April rather than make her his friend. To be honest, it never made sense to me that he wanted April to be his friend. From where I stood, every subject of April made Donnie, Timothy's real friend, sad. I would think that he would want revenge for that; might just be me though.

Anyway, I hope this story is good. Be honest. I only have one rule: No Flames.

A Kind, Yet Broken, Heart

It was late at night when Leo, Raph, and Donnie heard a sound coming from the living room, which they guessed was the TV. Curious as to what was on, the three older turtles ventured into the living room and found Mikey sitting in front of the TV watching an animated show that they had never seen before with a crate next to him. From where they stood, it looked kind of ridiculous.

"What the heck is this nonsense?" Raph asked, "It's terrible."

"Terribly awesome!" Mikey declared, and then stood up and picked up the crate. He carried to crate over to his brothers and said, "I found these old tapes in a dumpster."

"Tapes?" Raph asked.

"Check it out. The show is called "Super Mecha Force 5"," Mikey explained as he held the crate out to his brothers.

Donnie picked up a tape and inspected it while Leo commented, "Dude, this is awful. And you guys complained about "Space Heroes"."

"Their lips don't even match what they're saying," Raph scoffed, "I could never watch a show this bad."

"Are you sure?" Mikey asked, doubting his brother's words.

"I'm positive," said Raph with confidence, "And I can prove it. If you actually get me to watch at least five episodes of this show, I'll give you first slices of the next ten pizzas we order."

"You sure you wanna make a wager like that, Raph?" Donnie asked, "You might end up having to go through with it."

"Donnie, trust me, I now what I'm doing," said Raph, and then turned back to his youngest brother and asked, "So, deal?"

Mikey shook Raph's hand and said, "You got a deal, brother! Say, how about Leo and Donnie watch too? You know, so they're not left out."

The three thought about that for a moment and then answered, "Okay."

All four brothers sat down together in front of the TV and proceeded in watching the video tapes that Mikey had brought home. At first, the brothers were sure that they were right in that they would not get into the show, but, sure enough, they had gotten through four episodes and were in the middle of a fifth, and they were enjoying it; it seemed like Mikey won.

"So, that girl is the princess of an entire planet?" Raph asked. He smiled and added, "Cool!"

"Yeah," said Mikey, "And she also pilot's the robot's left leg. She rules! But that scientist dude in green made the robot."

Donnie smiled at the show and commented, "The story has such an intricately layered plot. Four stars!"

No sooner did Donnie say that when the next scene started to play. In the scene, the scientist was asking the princess out to dinner. Unfortunately, the princess harshly refused and walked away, leaving the poor scientist crushed. Donnie looked upset by the scene while Leo, Raph, and Mikey started laughing their butts off at the scientists' misfortune.

"Oh, Donnie, that's so you and April, dude!" Mikey said between laughs.

"It is not!" Donnie snapped. He then got up and walked away as he said, "Ah, this show is lame anyway. The plot makes zero sense. I'll be in the lab."

And with that, Donnie stormed off to the lab, leaving his brothers in the living room to finish watching the show; seemingly oblivious to how hurt their brother was at the moment.

Once he was in the lab, Donnie decided to get to work on the retromutagen to cure April's father, Kirby. Before he started, Donnie caught sight of the pictures on the wall. Several of them were of him and his brothers, there were a few of the three of them and Splinter, and one of just Splinter. His eyes landed on a single picture on the wall inside a frame with hearts around it. It was a picture of him and pushing April on the swing in the park, and they both looked very happy in it. He remembered Leo taking that picture; April said she had a great day that day. He smiled for a moment, but his smile faded almost as quickly as it appeared when he remembered that, currently, April resented him and his family.

"What am I to April, anyway?" Donnie asked no one in particular, as he took the picture off the wall, "I'm worse than a nerd. I'm a freak! To her, we're all total complete frea-"

He stopped in mid sentence when he realized Timothy could hear him. Feeling bad for upsetting his formerly human friend, Donnie walked over to the tank, put his hand on the glass, and said, "Sorry, Timothy. I didn't mean to upset you. I'm just frustrated."

Saddened by his friends emotional state, Timothy started liking the glass on the tank, right where Donnie's hand was resting, as though trying to comfort him. Donnie misinterpreted his actions as him signaling hunger and dropped some snacks into Timothy's tank and then put the picture down on the work table. As Timothy ate the food Donnie gave him, he could more clearly see how hurt Donnie was and felt bad for him. He glanced over at the table and saw the picture of Donnie and April. He glared as he thought about how hurt and sad Donnie was and knowing that she was the reason. Donnie did not seem to notice as he started working on his latest retromutagen.

As he worked, Donnie told his friend, in an encouraging manner, "Don't you worry, Timothy. I'm going to create a cure, a retromutagen. I swear, I'll do everything in my power to make you human again. Along with April's dad and any other mutants out there." Timothy was glad to see Donnie happy for a moment, and Donnie's smile faded as he let out a sad sigh and said, "Not that it really matters in April's eyes. Even if I cure every mutant in the world, she'll only see me and my brothers as the guys who mutated her father. But, regardless, I'm going to help you and the other mutants, my friend."

This comment made Timothy even madder. How could someone be so cruel to someone so kind? He wondered. Timothy could no longer stand to see his friend this hurt and sad. He wanted to help, but there was very little he could do. He could not simply reach out a hand of reassurance or offer a comforting hug for he was trapped in his tank. And even if he could get out, if he tried to hug his friend, Timothy would accidentally burn him. So how could he help his friend? He wondered.

Donnie added a drop of his latest retromutagen batch to some regular mutagen and waited to see what happened. To his surprise, the mutagen froze and them shattered the beaker.

"Frozen?! Darn it! Another batch lost!" Donnie yelled in frustration as he pounded the table, "I'm not giving up. I'm going to make you and Mr. O'Neil human again, Timothy. If it's the last thing I do."

Donnie got up from his desk and walked away to get some more supplies, leaving his barely human friend alone with the picture and the mutagen. Timothy continued to stare at the picture of April with a hateful glare as he thought about how sad Donnie was. This girl was the cause of it! She hurt Donnie, a kind and caring being! She had to pay! He thought. But how?

His eyes landed on the canister, which still had a small amount of mutagen left inside. Curious, Timothy reached his lips outside of his tank through the small opening, which Donnie used for feeding, and moved it into the canister. Once he got his lips close enough, Timothy slurped up the mutagen and swallowed it. After the chemical reached his stomach, Timothy felt his body start to change; he began to feel physically stronger. Timothy now knew what he could do for his friend; he could avenge his pain. All he needed was more mutagen.

Suddenly, he heard footsteps and looked up to see Donnie returning to his work station with a box in his hands.

"I'm back, Timothy. I just had to grab some more beakers and a microscope. I also had to grab a couple of petri dishes-" Donnie said, then stopped in mid sentence when he saw that his canister was now completely empty. He scratched his chin and said, "That's funny. I was sure there was still mutagen in there."

Timothy momentarily worried that Donnie might figure out what he did and get mad at him. Luckily for him, Donnie simply shrugged it off and said, "Guess I was mistaken. Oh well, that just means I'm free for the rest of the night. Wanna do something? Blink once for 'yes' and twice for 'no'."

Timothy immediately blinked his eyes once to say, 'yes', happy to spend time with his friend. Donnie and said, "Great. What would you like to do? Maybe read a story from a comic book?"

To that, Timothy blinked once. In response, Donnie went to his comic book collection and showed his friend what he had. He told Timothy to blink once if it was one he wanted to hear and twice for one he did not want to hear. The first two comics were 'no's, but he got a 'yes' on the third. Donnie and saw that he had showed him "Major Justice".

Donnie smiled and said, "Good choice, Timothy. This guy's my favorite! He rules! You know, he started as weak and skinny; sickly even. But, he always had a good heart and only wanted to help others. So, when he was chosen to be the first super soldier, he finally had a chance to make his dream come true when the formula made him physically stronger. When I was little, I wanted to grow up to be just like him."

As Donnie told the story, Timothy could see why this hero was Donnie's favorite. In a way, they were a lot alike; Donnie was not as strong as his brothers, but he had a good heart filled with kindness and compassion. Timothy also saw how Donnie's face lit up as he talked about his favorite hero; he liked seeing his friend this happy. After he was done explaining the hero to Timothy, Donnie positioned himself in front of the tank in a way that he could read the lines to Timothy and Timothy could see the pictures. Donnie wound up reading the comic book to Timothy until he became so tired that he had to go to bed. He bid his friend goodnight and then went to his room.

After Donnie left, Timothy looked back at the picture and growled. Though Donnie could not hear it, Timothy made a vow.

"Donnie's pain will end. April O'Neil will be destroyed."

Author's Note: For those who are wondering, "Major Justice" is a parody of "Captain America".