Heavy the Robot

Heavy and Bomb are two robots who first appeared in Knuckles’ Chaotix.

Heavy is a clunky, silver robot with red boxing gloves for hands, who resembles a Kettle and was Dr. Robotnik’s chief mechanic. In the game, Heavy was invincible to all attacks, could destroy badniks by just touching them, and could walk on spikes without being hurt, but (as his name suggests) is extremely heavy, causing him to be very slow and unable to jump very high. Heavy's invincibility, however, is actually very handy when used in combination with Charmy's flying (as long as Charmy is the leader).

Bomb is a small, black and red bomb robot. His abilities are the reverse of that of Heavy: He is very weak, and explodes when hit (albeit he can regenerate himself almost immediately afterward, while the explosion can damage both enemies and his ally) but is rather quick on his feet (though not anywhere near as fast as Espio) and has a decent height jump.

The two robots claimed to have escaped from the clutches of the evil Dr. Robotnik, and are simply trying to help Knuckles and his friends. However no one knows if they speak the truth or if they were simply planted by Eggman to slow them down. After Robotnik’s demise at Newtrogic High, the duo disappeared and has not been seen since.

Heavy and Bomb also made appearances in the Sonic the Hedgehog comics, serving in King Acorn's Secret Service under Geoffrey St. John. However, on one mission, the two were reprogrammed to assassinate the Acorn family, and were destroyed by the defending Sonic and co. Later, rebuilt versions of the two were sent to assassinate Mina Mongoose. However, they were also thwarted, and presumed destroyed, although they are never seen being so. The new Heavy was last seen sinking in a lake, while Bomb blew himself up (repeatedly).