The Big Vent

S1 E10: Will (Eric McCormack) and Grace (Debra Messing) become hooked on a real-life soap opera unfolding in their neighbors' apartment when they begin eavesdropping through the new heating vent in their floor. As Will and Grace live vicariously through the marital infidelities of the downstairs couple (guest stars Tom Sullivan and Corinne Bohrer), Jack (Sean Hayes) feels neglected and enlists Karen's (Megan Mullally) help in staging a play that drives the message home to his two best friends. Robert Curtis Brown and Jensen Daggett ('The Single Guy') guest-star as the stage actors who portray Will and Grace.