Pluto

Pluto is a planet in space, it's native inhabitants are Plutonians. It's first mention is in episode 5 To Boldly Go. Malark was named King after landing on the planets' surface in his escape pod from the previous episode. The natives still see Malark as their one true king to this day.

Wack
Wack was a mecca space being. His maker sent him out as a sentient to be himself, Wack crash landed on Pluto, a Yeti helped him and cared for him. They got in a fight and Wack ran to the bottom of the ocean where the Yeti could not follow him. He stayed there sulking until The Revengers showed