Three's Company S01 E02 And Mother Makes Four

"Come and knock on our door"

Jack is all set to move into Eleanor's room, until Chrissy's mother unexpectedly shows up. Chrissy's mom does not know that she and Janet live with a man, so she tries to keep them out of sight. Janet and Jack go to the Regal Beagle to hide out, and Mrs. Roper finds out that Jack is not really gay. She manages to keep it secret from Mr. Roper.