Alex looked behind him at the two girls,  and then some dude was crawling up in the hole, saying something about he can't handle it...Oh gosh, hope he isn't claustrophobic. 
"Okay guys, I think we all sorta well know why we are up here, and um, I trust you, so freak out a little, don't scream, and try to keep up." Alex said as he shrunk down into a rat.
He squeaked at them, then turned ,running along the metal frame as if it was nothing.

He wasn't really paying much attention to them as he was Balancing as his first time as a rat. 
"I smell something....Mmmmm....cheese." the rat turned down the wrong corridor.
He made his way to the kitchen, and stopped at the vent when he heard voices.
Alex turned back into human, and brought his finger to his lips "Shhhhh"
Listening he could hear at least two voices he didn't recognize, and they were saying something about gases..

He looked at the group, "Get out alive, I'll cover ya."
Alex stepped on the time and fell thru the floor landing between the two BSI agents.
When He rose up, he stood around twelve foot tall with a huge mouth full of razor sharp teeth,and massive bear claws, the Kodiak kind. 
The hulking bear swatted one of the agents thru a wall, as it roared at the other one inches from his face!