Gargadan is described as, "...a twisted abomination - a cruel experiment gone horribly wrong. He is a fusion of a lion, dragon, and snake. The lion head seems to be in charge of the others, directing the creature's actions. Each head has its own mind though, and sometimes disobeys."
CoffeeWithGames shows a full battle against Gargadan in Rage of the Gladiator's Challenge Mode, using the game's Wii MotionPlus control option.
CWG shows it is possible to get a "Rank A" in Challenge Mode without using any high level special attacks against Gargadan.