Hudson is a humanoid astronaut who is trapped by a bunch of alien pigs in the "Return to Beneath the Planet of the Pigs" sketch on The Muppet Show: Sex and Violence.

The name "Hudson" is given to him when posing as a pig butler, in reference to Upstairs, Downstairs. However, the design sketch for the character labeled him as "Rex".^[1]

Sources

1. ↑ Jim Henson's Red Book entry