Gus as he comes out of his portal.
Gus
Gus is the third alien encountered in Tank 2-3. The game forces you to use food to kill him (he also dies when he eats too many fish), because they say that lasers can't hurt him. However, it is possible to attack him with lasers. In Sandbox Mode, summon Gus and another alien affected by lasers, and you are allowed to use the laser on him, or during the Cyrax battle.
The warning for when Gus is about to appear.