Three's Company - Season 3 Episode 13
Eleanor's Return

Eleanor makes her first appearance in the shower when Jack meets her for the first time. Knowing that Eleanor was Janet and Chrissys old roommate, he thinks that Eleanor is moving back in and he might have to leave. What he doesnt know is that they are planning a surprise party for him, but its too late when Jack tries to ruin the party by having Larry streak across the room!