Plot summary
Angela hires a new creative director for the Bower Agency, Jack (David Paymer). He and Angela start working very late each night to get some of their ideas off the ground. Tony begins to get jealous and suspects Jack of trying to take the agency away from Angela. They have a big presentation in the morning and have decided to work through the night in a hotel room at the Plaza hotel in order to get ready for it. Tony uses the pretense of delivering Angela's notebook to check up on them, and he finds a reassuring surprise.
Credits
Adapted from Wikipedia contributors, List of Who's the Boss? episodes. HTML formatting and reference markers removed.