Donnie

I was working in my lab creating a new invention to help us out on patrol around the city if the Kraang or the Foot are planning anything. 

"Donnie?" I heard Athena calling me as I looked over at her in concern.

"Hey Athena," I greeted.

"Do you have any band-aids? I'm playing hospital with Miss Rabbit." She asked.

"Uh, sure." I replied as I walked over to the cover opening it to get out 3 band-aids for her.

"Thank you." She said walking away legless. Oh...wait...LEGLESS!?

I hurried to find Athena gone but I rushed into the living room where my brother's were watching tv or reading comic books.

"Guys, uh, there may be something wrong with Athena." I gulped.

"What's wrong with her? Is she sick?" Leo asked.

"No. Let's just say..."

"Does anyone know how to make tea?" She asked entering the room invisible holding Miss Rabbit in her arms as we shrieked.

"DUDE! She's a g-g-ghost!" Mikey cried.

"I'm not a ghost Mikey." Athena giggled as she reappeared back to normal.

Raph looked at me with wide eyes,"Donnie! Lab experiment. Now!" 

I carried Athena to my lab to see how or what is making her do these such things. I did a blood test that took 24 hours to wait for the results to come in and that's what shocked me.

"I found out what's causing her to do this. It's the mutagen." I said.

"Mutagen? She didn't even get a single drop from the mutagen to turn her into that." Raph claimed.

"No. But, it could've been when we were saving her after that Kraang almost put it in her brain. She might've accidentally  stepped in it." I suggested as we turned around seeing Athena floating around upside down as Mikey caught her and flipped her right side up.

"I was flying!" She giggled.

"Well, I think we're going to keep a close eye on her. Who know's what could happen to her with those powers of hers." Leo said.