The gang welcomes back an old friend and says hello to a newcomer: Dylan McKay returns to Beverly Hills after a three-year absence and surprises his old companions on Thanksgiving Day and Donna introduces her sexy, ice-skating cousin Gina Kincaid to everyone. Meanwhile, tragedy strikes when Noah blacks out from drinking and later realizes he may have been the drunk driver in a hit-and-run accident. David gets into hot water when he becomes involved with a mysterious fan of his radio show. Steve and Janet further define their new romantic relationship while Donna plays matchmaker with Kelly and Matt. Meanwhile, Valerie bids the gang a heartfelt goodbye as she leaves Beverly Hills after four years.
Arrivals and departures, near disasters and brewing calamities, relationships tested and re-formed...all are swirling through the Thanksgiving holiday for the gang and its members. The "goodbye" of the episode title is applicable to Valerie Malone. Seems Val wrote Brandon a letter advising him not to marry Kelly. Unfortunately for Val, Kelly found the note when they were sorting through Brandon's remaining items (destined for his new place in D.C.) and Kelly is furious at Val over this. Donna and David are both stern with Val about how awful the letter was, but when David learns Kelly arranged to ruin Val's plans to host Thanksgiving, he clues her in about the sexual abuse and self-defense killings that left Val a ruined person. Kelly attempts to mend bridges with Val, and when everyone somehow does show up at Casa Walsh for Thanksgiving dinner, the longtime enemies declare a truce. But Val has something else to tell everyone: she's accepted her mother's offer to return to Buffalo and work through their traumas together, and she's flying out tonight. David sees her off with a bittersweet kiss and hug. The "hello" has two people attached to it, one a newcomer and one not so much. The former is one Gina Kincaid, Donna's poor cousin who became a star ice skater. Alas, Gina has become a has-been working at an ice cabaret show where her angry attitude leads to her getting fired and having her agent axe her as a client. Gina lies about her reality to Donna and her friends, and doesn't really get to interact much with anyone.
The latter is Dylan McKay, who turns up for Thanksgiving dinner and is greeted with universal happiness. Only thing is, Kelly has become romantically interested in good-guy attorney Matt Durning, and having Dylan back in town is a huge surprise to her. Noah's near disaster involves his continued and unapologetic alcoholism, leading to him driving drunk and smashing into something with his car. He's deathly afraid he hit a kid on a bike and left him on life support, and Donna finally tells him off when she sees he's still drinking afterwards. Noah goes to the police and confesses to what he thinks he did, but later learns he only hit a dumpster (the real criminal was a woman in Pasadena who got arrested) and tells Donna she was right and he's going to combat his problem seriously going forward. David, who clearly misses Sophie, has a blonde woman appear at his show and he sleeps with her. Problem is, she's a teenager who used a fake ID and is actually just 17 years old, and she lets him know her parents want David prosecuted statutory rape. David goes to Matt for legal counsel and learns he's in a LOT of trouble. And while Steve is eager to be Janet's boyfriend after their ghost story hook-up, Janet simply wants them to be "bed buddies". A story in their newly tabloided Beverly Beat about a long-married couple where the wife is allergic to her husband inspires Steve to tell Janet he wants a real relationship with her, period.
- Jennie Garth as Kelly Taylor
- Ian Ziering as Steve Sanders
- Brian Austin Green as David Silver
- Tori Spelling as Donna Martin
- Tiffani Thiessen as Valerie Malone
- Vincent Young as Noah Hunter
- Vanessa Marcil as Gina Kincaid
- Lindsay Price as Janet Sosna
- Daniel Cosgrove as Matt Durning
- Joe E. Tata as Nat Bussichio
- special guest star
- Luke Perry as Dylan McKay
- David Bickford as Justin Olson
- Victor Brandt as Artie
- Clayton Landey as Chris Getz
- Gwen McGee as Desk Sergeant
- Jennifer O'Dell as Nancy Ann
- Annie O'Donnell as Terri Olson
- Tricia O'Neil as Mrs. O'Lare
- Al Rodrigo as Det. Caliendo
- Christa Sauls as Denise O'Lare
- First appearance of Dylan McKay since 1995
- Last appearance of Valerie Malone until Donna and David's wedding.
- First appearance of Gina Kincaid
- Luke Perry is billed as a Special Guest Star in the opening credits from here on out.