The Aparoid Walker is a four-legged gargantuan Aparoid. Its first (and only) appearance was in Star Fox Assault in the Star Fox Team's second mission: Katina Outpost. The Walker has multiple attacks: homing missiles, anti-aircraft missiles, and more.
It has a weak point on its upper side and attacking it may result in its destruction. There's another not-weak point under it and attacking it will make the Walker faint for a while, that way Fox can reach the upper side to attack its weak point by hovering up with the Landmaster.
Its sole purpose was to decimate the Star Fox Team; as well as take control of the Katina Outpost. Given Fox's comments, the Aparoid Walker is apparently the lead unit of the Aparoid swarm on Katina.
- In Nintendo Power magazine, this Aparoid was referred to as the "Arachnaroid." 
- The Aparoid Walker has a similar appearance to the enemies in Code Lyoko called "Krabs". However, Krabs are red, and are slightly smaller, while the Aparoid Walker is very large, and purple.