Because asteroids was already taken.
A stand up guy
Surely they should be called asteroids?:
It's two tired.
He's a keeper
An animal that talks your head off.
Incommunicado
Works it out with a pencil.
When it's broke.
The Ultra-sound guy..... Who covers him when he's not available The hip replacement guy!
T-A-T-E-R.
It doesn't Mather.
Jello-us
Rob...wait for it... erto! Rubeartoe!
I guess I didn't plan it very well!
Falafel Raptors. (sorry)
A Neckromancer
A necromancer