7th Heaven - Season 5 - Eps 18: Apologize
The striking resemblance of Robbie's new friend, Marie, to Mary raises eyebrows among discerning Camdens. Annie's invitation for her to stay for dinner makes things weirder for them. Back in Buffalo, unbeknownst to Robbie, Mary accidently bumps into her old boyfriend Wilson (guest-star Andrew Keegan) and his son Billy at the train station and makes plans to meet him for the evening. Mary is unsure on whether she should tell Robbie, but confides in her family about this. They all say that she should tell Robbie about this, but decides to ignore their advice. Also, Matt meets Robbie's ex-girlfriend, Cheryl, at the restaurant where she works. He starts to have feelings for Cheryl and tries his best to try to get her to go on a date with him. His efforts work by the end, but is having a hard time telling Robbie about his interest in his ex-girlfriend.
About 7th Heaven

Title: 7th Heaven
First Air Date: 1996-08-26
Last Air Date: 2007-05-13
Status: Ended
Rating: 6.4/10 (from 205 votes)
Language: EN
Seasons: 11
Total Episodes: 243
Network: The WB The CW
Genres: Family, Drama, Comedy
Production Companies: Spelling Television, CBS Studios
Synopsis
Reverend Eric Camden and his wife Annie have always had their hands full caring for seven children, not to mention the friends, sweethearts and spouses that continually come and go in the Camden household.
Cast

Stephen Collins
Eric Camden

Catherine Hicks
Annie Camden

Beverley Mitchell
Lucy Camden

George Stults
Kevin Kinkirk

Nikolas Brino
Sam Camden

Lorenzo Brino
David Camden