Empress Mung

Empress Mung is the main antagonist of the Letter People three-part episode "Star Trip." She rules a fictional planet named Snickers, and her villainy is kidnapping a Letter Person.

Initially, her hostage is Miss A, but then Mister R arrives, and they both make the same sound as Mister R's name, impressing Mung so much that she releases Miss A, but she keeps Mister R captive.