In the debut episode of the series set in Santa Monica, California, Janet and Chrissy have woken up the next day after the moving away party for their friend Eleanor. Chrissy enters the bathroom to find a man (Jack Tripper) sleeping in the tub so she he runs and gets Janet. Jack is startled awake and discovers he's soaking wet while Janet holds a ladle out like a gun, asking "Who are you?" (in her short lived New York accent). Jack introduces himself and tells them he was one of the party crashers. They get Jack out of the bathroom and offer to dry his clothes in the ...

On Jack's move in day, Chrissy's mother, who doesn't know about him moving in, drops by unexpectedly for a visit.

Karen (Mr. Roper's niece) becomes bored while visiting, so Stanley sets her up with Jack figuring she's "safe" from any fooling around with him. Jack misses Janet's birthday for the date as well.

Jack is suckered into taking a little puppy off the hands of his friend Larry. Unfortunately, this breaks Roper's rules of "no pets or children." Jack must then find a way to hide the pup until he can find someone else to take care of it. In the meantime, Chrissy begins sleepwalking. Plus, Mrs. Roper's birthday is coming up and Stanley must find a present for her.

A bully at the Regal Beagle comes onto the girls, so Jack comes to their defense.

When the rent money comes up missing, the roommates panic and call the police. They also avoid Mr. Roper who only wants to invite them out for dinner.