Cliff gets a call from his estranged father, who he hangs up on.
His dad then shows up at Cheers.
Since he doesn't know what Cliff looks like, Cliff pretends to not be there.
Right before his dad leaves Cliff reveals himself.
Diane gets along a little to well with Sam's date Claudia. Claudia invites Diane to come with them to dinner and Sam calls the restaurant to make sure that the table can only fit two to make Diane feel left out.
Sam ends up being the one sitting alone at dinner, while Diane and Claudia share a table.
Later back at Cheers Sam comes on too strong and Claudia decides that they shouldn't date.
Sam thinks that Diane sabotaged his date with Claudia because she loves him.
Diane feels sorry for Sam so she has coffee and cake with him.
Cliff's dad asks him to leave the country with him. Cliff finds out his dad is a man on the run.