In the Beverly Hills, 90210 episode " Cardio Funk " (Season 2, Episode 23), Brenda and Dylan both navigate temptation with new people after a cardio-funk class and an AA meeting, respectively. They both kiss these new acquaintances and then confess to each other about their actions, choosing to stick together despite their infidelity. Meanwhile, the Peach Pit attempts to start a karaoke night which fails after only attracting interest from Jim Walsh. You can find full details for this episode on IMDb and the 90210 Wiki .
Beverly Hills, 90210 - Season 2, Episode 23 - Television of Yore Beverly Hills 90210 2x23