Silly headcanon time: Terl is actually the only villain who is tolerated in Spoony’s apartment.
Spoony still thinks that the alien is quite annoying from time to time, but his bad acting and jokes make him laugh and Terl’s stories from his years on Psychlo are actutally interesting and nice to listen to when there is nothing to do.
Also, Terl shares Spoony’s passion for wrestling. And screaming at the TV. :P