Joe Wylee is a police detective who's engaged to Dale Arden. In the episode Template:112, his police captain suspends him, thinking that he's unfit to be a cop.
In the episode Template:115, he travels to Mongo and for the first time meets Ming the Merciless. Joe agrees, by the end of the episode, that the fewer people who know about Mongo the better.
At the end of the episode Template:117, Joe sacrifices himself to complete the destruction of Ming's aqueduct.