Inficolor Ox

"..."-Inficolor Ox during the whole episode

Inficolor Ox
Inficolor Ox is, chronologically, Princess Bubblegums first known pet it is unclear if Science the Rat, or Inficolor Ox came first

Physical Appearance
Inficolor Ox is ,as the name implies, wearing a pair of Inficolor 3D Glasses

Inficolor Ox is a Musk Oxwhich seems appropriate as Musk Oxes can be found in the Gobi Desert