Bones (MMPR)

Bones is a monster created by Finster. A skeleton with a large hat, who could reassemble his body after being blown apart. He could detach his skull to fly around and batter the Rangers, and if blown up by them he could reform himself as long as his skull was intact. His flying, disembodied skull could teleport the rangers to another dimenson. He was destroyed by Trini after having his head thrown down a pit full of lava causing his body to be destroyed.

He is the first monster the Power Rangers ever faced (not counting Goldar), one of the few to have his own set of minions (glowing skeleton warriors), and was the first boss in the original Mighty Morphin Power Rangers Super Nintendo video game.