The Gatling Fox is a small Zoid with an open-air cockpit. Compared to other Zoids in the Zoids: Wild series, it is an M-sized Zoid.
The Gatling Fox first appears in episode 5, where the Empire uses its stealth to take down republican targets. However, Baan doesn't realise that the Empire controls the Fox by use of a visor that takes away free will.
A chance encounter with Walter Borman reveals the nature of the device controlling the Fox, and Baan removes it, betraying the Empire in the process.