Family: Hive Aliens
- They have two forms of attack, a short range melee attack that they use when the target is close to them, and a ranged "Corrosive Spray" attack that hits all crew members near the target as well.
- The Corrosive Spray Attack hits 6 times and adds up to about 3 times the damage of the melee attack, making it a bit dangerous. The walker must recharge for a short period of time after using this attack, however.
- The walkers can appear starting from the first wave