Dobkeratops (also known as Doppelganger) is the first boss of the game R-Type and one of the most recurring boss of the R-Type series.
Dobkeratops was the boss of the first level of R-Type, The Encounter. Dobkeratops' only weakness was a small green creature in the middle of the middle of Dobkeratops body. Eventually, Dobkeratops was defeated and the R-9 Arrowhead could access the gateway to another dimension that the gigantic Bydo was guarding.
During the events of R-Type II and Super R-Type, the Bydo Empire found the remain of Dobkeratops, they encased the corpse of the Bydo in an armor and turned him into a "cosmic destroyer". Subtom guarded a former base of the Bydo Empire, Dobkeratops was also featured in his original R-Type appearance on the American box-cover of Super R-Type, however, Dobkeratops only appeared as Subtom in that game.