Actors:
* Jason Priestley (Brandon Walsh): Priestley's portrayal of Brandon, the good-natured and thoughtful heart of the show, was widely praised. He also directed several episodes.
* Luke Perry (Dylan McKay): Perry's brooding and rebellious Dylan was an instant fan favorite, and he became a teen idol.
* Brian Austin Green (David Silver): Green's portrayal of David, the nerdy but charming friend, evolved significantly over the series.
* Ian Ziering (Steve Sanders): Ziering brought an element of fun and athleticism to the role of Steve, the popular and outgoing jock.
* Gary Cole (David's father): Cole's portrayal of David's strict but ultimately caring father was both funny and touching.
Actresses:
* Shannen Doherty (Brenda Walsh): Doherty's portrayal of Brenda, the complex and dramatic sister, was both praised and controversial.
* Jennie Garth (Kelly Taylor): Garth's portrayal of Kelly, the popular and glamorous friend, evolved from a stereotypical cheerleader to a more nuanced character.
* Tori Spelling (Donna Martin): Spelling's portrayal of Donna, the sweet and lovable friend, was both endearing and entertaining.
* Tiffani Thiessen (Valerie Malone): Thiessen's portrayal of Valerie, the new girl who shook things up, was both sassy and intriguing.
* Carol Potter (Cindy Walsh): Potter brought a sense of warmth and strength to the role of Cindy, the supportive and wise mother.
It's important to note that this is just a small selection of the talented actors and actresses who graced "Beverly Hills, 90210". The show had a strong ensemble cast, and many others contributed to its success.