Welshie

Welshie was a redshirt Star Trek actor, who replaced James Doohan in the 2199, because Doohan had trouble yodelling.

However, when the Planet Express crew ran into the former cast of Star Trek on Omega 3, Melllvar finally appeared to explain how he had kept the Star Trek cast alive, though in obsession with being the biggest Star Trek fan, he would often focus his anger on Welshie, which eventually killed him.

Trivia

 * Both his name, and what he says seems to imply that he is Welsh.