Captain Triumph is almost but not completely invulnerable. On numerous occasions he is shot repeatedly, and the bullets have no effect. Attempts to kill him with knives or swords see them bend or break on his body. Hitting him with an axe results in the axe handle breaking. He survives a pointblank bazooka blast with no damage. Being shot with an atomic beam that can cut through "anything" (and does in fact easily cut an oceangoing freighter completely in two) only causes him to laugh and say, "I’m ticklish!" When faced with a powerful "explosive pill" about to go off and wreck a defense factory, his solution to the problem is to simply swallow the pill. However, being exposed to the sonic vibrations of a "screaming bomb" that kills normal people does render him temporarily unconscious.