Robots that fought once in any version of Robot Wars, and lost their first or only battle, not returning after this loss. This includes robots that lost in the first round of their only competition, and subsequently lost in a losers melee or playoff in the same competition. This does not include robots that only lost in the Gauntlet or the Trial or robots that never made it into the arena, as they both have their own separate categories.

Lightning Tracks

Thor's Hammer

Excaliber

Razzler

Crasha Gnasha

Yeborobo

Shuriken

Leighbot