FINN & RACHEL, SEASON ONE
First Meeting, "Pilot": Rachel the loner and Finn the popular quarterback become unlikely friends through show choir.
First Kiss, "Showmance": Finn and Rachel kiss for the first time after a private rehearsal in the auditorium, which is abruptly ended by Finn's, um, premature problem.
Going Steady, "Journey": Finn tells Rachel he loves her before they perform Journey's "Faithfully" at Reginoals, and they end the episode as a real couple.
FINN & RACHEL, SEASON TWO
Break Up, "Special Education": Rachel finds out that Finn slept with Santana, so she plans to sleep with Puck as revenge. She doesn't go through with it, but Rachel tells Finn what almost happened. He is heartbroken, and breaks up with her.
Back Together, "New York": While performing at Nationals, Finn and Rachel kiss onstage after singing an original song called "Pretending." They lose at Nationals, but at the end of the episode Finn and Rachel decide to give their relationship another shot.