Rollerbot

Rollerbot is a character from the video game 'Splosion Man on the Xbox Live Arcade.

Description
'The Rollerbot is an enemy you'll encounter at Science Labs. But don't let that fool you, he is quick on his wheel, and even quicker to attack. Patrolling back and fourth, the rollerbot is like a guard dog, always watching for intruders. Your best bet is to try and sneak up on him for a 'splosive surprise.'

Trivia

 * A Rollerbot appears in a video on the 'Splosion Man website with an arm missing. A scientist repairs him, but the Rollerbot violates the scientist. The video is also an unlockable on Ms. 'Splosion Man at the mall.