Uncle Rattler

A snake-like criminal whose primary weapon is stun venom, and a genuine one-off. He is referenced on exactly two pages of the fan record, the episode and the character guide, and that is the whole footprint he has left in forty years.

His function is comic. He beats Mon*Star’s own crew to a score, and the episode plays that as a humiliation for Yes-Man, who turns out to be his nephew. The family relationship is asserted independently by Wikipedia and by our own episode synopsis, so it holds. Nothing else about him does.

The episode around him is worth noting on its own account. Its cast list also carries Space Bandit, Spike, Cyclops and Harry, so it is one of the densest minor-character episodes in the whole run.

Voice. Wikipedia credits Peter Newman. The ThunderCats wiki has no article for him at all, only a redlink in its own minor villains list, so we would not print that as a fact.