SkullGreymon

SkullGreymon is an alternate Ultimate form of Agumon.

Appearance
The "skull" prefix in his name refers to his body, which is completely fleshless and entirely composed of bone. He has a missile that lies on his back that is shaped like a shark.

Personality
SkullGreymon is a destructive and uncontrollable Digimon that results when Greymon is induced to Digivolve incorrectly.

Digimon Adventure
In The Arrival of SkullGreymon,

Digimon Adventure 02
In The Emperor's New Home,

In The Captive Digimon,

Trivia

 * SkullGreymon is similar to Megidramon from the third season. Both are a corrupted form the main Digimon turns into due to their partner going about digivolving them the wrong way.