The Big Vent is the ninth episode of the first season.
Will and Grace 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, Jack feels neglected
and enlists Karen's help in staging a play that drives the message home to his two best friends.
- Eric McCormack (Will Truman)
- Debra Messing (Grace Adler)
- Sean Hayes (Jack McFarland)
- Megan Mullally (Karen Walker)
- Corinne Bohrer (Judy)
- T.F. Sullivan (Thomas)
- Robert Curtis Brown ("Will" actor)
- Jensen Daggett ("Grace" actor)
- Titus Napoleon (Roger Waka-lana-huki)