Question: In which "The Simpsons" episode written by Jack Barth and directed by Mark Kirkland does this fictional character (who usually does low-level work) voiced by Phil Hartman appear as the main character?
Sentence (from "Troy McClure"): McClure also 'hosts' "The Simpsons 138th Episode Spectacular" and "The Simpsons Spin-Off Showcase".
Relevant evidence: No