How about an episode revolving around a cartoon or animation film where the actor that does the voice for the cartoon character is killed. (The kicker is the cartoon character's voice is really Jason! who is an accomplished voice actor in his own right)(sidebar- do they sell the Sherlock Holmes in the 21st century cartoon anywhere on DVD?).
The gang goes there to investigate the murder or series there of sabatoge. And by chance Randy (who is a big fan of the cartoon or the actor playing the character that died) is a dead ringer for the voice (duh cuz it's really his voice!) which while investigating the cartoon people or bigwigs producing the film NOTICE that (ala he imitates the voices while on the set or watching the cartoon being played in the background) and need him to Help them finish the film cuz there on a deadline and it appears that whoever is involved doesn't want the production to continue. Randy becomes the decoy to catch the killer who's motive is that the cartoon/animation film is never completed for what ever reason.
How's that????
