Deltamon

Deltamon is a Synthetic Digimon that has a metal head for a right hand and a skull head for a left hand. It is believed to have been the result of three Digimon merged during an electromagnetic storm.

Digimon Adventure 02
In the Digital World's "Death Valley" (Land of No Return in dub) where the latest Control Spire was, the sand sucked in Yolei Inoue, Hawkmon, Cody Hida, Armadillomon, Takeru "T.K." Takaishi, Patamon, Hikari "Kari" Kamiya and Gatomon in, leaving Davis Motomiya and Veemon untouched. When encountering the Digimon Emperor, Davis' friends were suspended from the ground over a Deltamon under the control of the Digimon Emperor's Dark Ring. When the Digimon Emperor asked Davis which of his friends he will have spared from Deltamon's triple appetite, Davis offered himself in their place, despite the Emperor's mocking reply that he would not satisfy Deltamon's hunger. Suddenly, Digmon appeared with the rest of the Armor Digimon (Halsemon, Pegasusmon and Nefertimon) and the Real DigiDestined. The fake ones were really Bakemon and they attacked. Davis was mad about being tricked and Armor Digivolved Veemon to Flamedramon. When the Digimon Emperor was attacked by Davis, the Digimon Emperor ordered Deltamon to destroy him before Flamedramon destroyed the Dark Ring.

Digimon Adventure V-Tamer 01
DarkTyrannomon and Deltamon were followers of Triceramon and guarded the entrance to the valley where the 1st V-Tamer Tag was. Tai and Zeromaru were able to bring them down.

Digimon World 2
Deltamon digivolves from Gizamon, and can digivolve further into Megadramon or Gigadramon depending on its DP.

Attacks 
 * Triple Force (Triplex Force): Shoots energy from all three heads, to create a super beam attack.
 * Serpent Bite (Skull Fang): Bites the enemy with the skull head in his left arm.