When Tyler shows up to take Meg on a date, he's surprised to meet her babysitter -- who is also her ex-husband Bryan, played by Cassidy's former "The O.C." co-star and current "Southland" cop Benjamin McKenzie. Despite Bryan's history with Meg, the dudes get along pretty well. Almost too well.
Tune in to TBS on Thursday, May 9 at 10 p.m. Est. to see the big teen drama reunion go down. In the meantime, watch Cassidy and Lenz get their flirt on in the clip below.