Gatatog Uvenk first appears as the leader of Clan Gatatog, which have reluctantly thrown their lot in with Clan Urdnot (led by either Urdnot Wrex or Urdnot Wreav depending on Shepard's actions in the first game). Uvenk is shown to be contemptuous of humans and is in fact something of a Krogan supremacist. He disagrees with Wrex's way of doing things if Wrex is in charge, which prompts Wrex to remind him of his place via a headbutt. He will be more approving if Wreav is Clan Leader, but even Wreav will not like Uvenk speaking for him.