"Open House" is the twelfth episode of the second season of Happy Days, as well as the 28th overall series episode. Written by Bill James, the episode, directed by Jerry Paris, first aired on ABC-TV on January 7, 1975.
While Richie's parents are away, Richie and Potsie unexpectedly find themselves hosting three stranded young women whose car has broken down.
Richie and Potsie plan to host a poker night at the Cunningham house as Howard and Marion will be out of town. However, their plans change when three young women stop by after their car breaks down, and Potsie invites them to stay the night.
- Melanie Baker as Lisa Ellis
- Nancy Bell as Chris
- Colleen Camp as Rose
- Cindy Cassell as Penny
- Joan Prather as Ruth
- Neil J. Schwartz as Bag Zombroski
- Patricia Wilson as Carhop