The Robot Mark 5 was created by Riff specifically to fight K'Z'K.
The Mark V was armored in heat-treated, triple-folded titanium. It was armed with multiple firearms, missiles, demon-blasters, spike weaponry, a ball on a chain, a screen that rapidly displayed the holy symbol of every major religion, and the Omni-Taser Supreme. The Mark V also contained the Dimensional Flux Agitator, but as an escape mechanism for the pilot rather than an offensive weapon, as Riff wasn't willing to inflict K'Z'K on an unsuspecting random universe.
The Mark V could be run either by a pilot sitting within it or by an AI based on a See-N-Say.
Mark III and Mark IV were apparently prototypes that were destroyed during Riff's experiments.