Ambulon

Ambulon is a Decepticon turned Autobot.

Ambulon was part of a Decepticon combiner experiment. This experiment is responsible for his current alt-mode... a leg. Years later he joined the Autobots as a Medic and was stationed at the William 'Sparkplug' Witwicky Repair and Maintenance Center.

"I Have the World's worst alt mode: I turn into a leg. Ambulon: from the verb "to ambulate," meaning "to walkabout." It's a stupid name..."

"... But all the best names are taken."

- Ratchet and Ambulon.

More Then Meets The Eye
Ambulon is stationed at Iacon with his fellow medics First Aid and Pharma.