"Top Billing" episode and the Comic it was adapted from.

A struggling actor (Jon Lovitz) can't get a role because of his looks.
His agent and girlfriend both leave him, but he's not going to give up that easy, he wants the role of Hamlet.
In order to secure a part in a strange production of Hamlet, he kills off his competition (Bruce Boxleitner)...
Only to discover that all of the actors in the play are escaped mental patients

and he's up for the role of Yorick!"

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