The Bull Alien is spawned from cattle hosts and has two horns on its head, and is very quick (able to outrun Stinger XT-37s) and powerful. This large Xenomorph variant can knock down military vehicles by rushing in. It is also very durable, capable of taking a rocket to the face without even flinching. Only fire seems to kill them.
Bull Aliens commonly operate in herds, another trait they inherit from their host.
- The original design of the Bull Alien is the most like the final product of the three original concept Kenner Aliens, the only major differences being a somewhat furry tail and nostrils, much like the original Gorilla Alien design. Interestingly, unlike the original designs for the Gorilla Alien and the Scorpion Alien, the original Bull Alien design did not appear in any Operation: Aliens merchandise, which used the finalized design instead.
- Aliens: Stampede
- Aliens: Fireball
- Aliens: Night Strike
- Operation: Aliens Combat Game (artwork only)
- Operation: Aliens