High-schooler Grover Beindorf and his younger sister Stacy decide that their parents, Janet and Ned, are acting childishly when they decide to divorce after 18 years of marriage, so they lock them up in the basement until they'll sort out their problems.

Kyle Howard
as Grover Beindorf

Jamie Lee Curtis
as Janet Beindorf

Kevin Pollak
as Ned Beindorf

Jennifer Tilly
as Cindy Figler

Christopher McDonald
as Donald Krupp

Sheila McCarthy
as Gwenna Krupp

Wallace Shawn
as Vic Finley

Caroline Aaron
as Louise Finley

Mooky Arizona
as Matt Finley

Herbert Russell
as T.J. Krupp