90210 Series Finale: The 15 Craziest Plots Throughout the Five Seasons

Remember when Annie was a prostitute? Or when Silver used a surrogate to get pregnant with her ex-boyfriend-turned-gay best friend's baby? Well, these are just two of the wild and crazy moments throughout 90210's five-season run.

What began as a show about two siblings moving from Kansas to Beverly Hills, navigating their way through high school cliques, finding friends, having first loves and trivial fights soon morphed into a world that included sex tapes, mental disorders, prostitution, pregnancy and even murder. Yes, if you stopped watching 90210 early on, there's a whole lot of crazy you missed out on.

So get ready to say goodbye to the world's most popular zip code with our roundup of the wildest plotlines throughout the show's history.

1. Ethan has oral sex (Season 1, "We're Not In Kansas Anymore")
You might've actually seen this one, given that it was in the first few minutes of the pilot. The series really starts out with a bang by alluding to Ethan (Dustin Milligan) having oral sex in the car before school — and by someone who was not his girlfriend. We later learn that he also lost his virginity to his girlfriend Naomi's sister.

2. Silver makes a sex tape (Season 1, "Life's a Drag")
As part of an assignment, Silver secretly tapes her and boyfriend Dixon (Tristan Wilds) having sex. It turns out that she has bipolar disorder and this incident leads to the diagnosis. In Season 3, Adrianna gets revenge on Silver by switching out her pills.

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3. Navid and Adrianna get engaged (Season 1, "The Dionsysian Debacle")
The two begin dating, only to learn Adrianna is pregnant from a one-night stand (a guy Annie later dated) when she was in rehab. Navid (Michael Steger) decides he still wants to be with Ade and says they should get married. Ultimately, they break up and Adrianna gives the baby up for adoption.

4. Annie kills someone in a hit-and-run (Season 1, "One Party Can Ruin Your Whole Summer")
After having an awful prom, Annie (Shenae Grimes) gets in her car, bottle of alcohol in hand, and ends up hitting someone before driving off. The following season, she starts dating Jasper (Zachary Ray Sherman), who knows that Annie killed his uncle. When Annie wants to break things off with him, he essentially blackmails her by revealing that he has evidence of the hit-and-run. Eventually she ends it, Jasper almost commits suicide, then sets fire to Liam's boat, and then doesn't turn up on the series again until Season 5.

5. Ryan knocks up Naomi's sister (Season 2, "Confessions")
Naomi learns her sister is pregnant and that Ryan (Ryan Eggold) is the father, so she, of course, is the one to tell him the big news. The next season, Jen (Sara Foster) gives birth, but eventually ditches town and leaves the baby with Ryan. Jen later returns and takes the baby to Paris. Ryan, who is now dating Annie and Dixon's mom Debbie (Lori Loughlin), asks her to move with him to Paris so he can be closer to the baby.

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6. Mr. Cannon rapes Naomi (Season 2, "Confessions")
Naomi (AnnaLynne McCord) learns the hard way that you should never cry wolf. After previously — and falsely — accusing her faculty adviser (Hal Ozsan) of sexual harassment, he rapes her in the season finale, saying, "Who's going to believe you?" The following season, Naomi's British friend Oscar (Blair Redford) realizes that Mr. Cannon's accent is from a different region than he had said and with that information, Oscar and Naomi are able to find Cannon's real name online and learn that he was wanted for sex crimes. The police go to arrest him, but he's fled — to Naomi's room. He ties her up, but Silver comes to the rescue and he's taken to jail.

7. Adrianna steals a dead guy's music (Season 3, "Senior Year, Baby")
At the start of the season, Adrianna (Jessica Lowndes) and Javier (Diego Boneta) return from touring, but when Adrianna won't hook up with him, he threatens to drop her from the tour. Fortunately for her, their limo is hit by a car and he's instantly killed. On top of that, Javier had just shown her the book of songs he wrote. So what does Ade do? Steals them and plays them off as her own and, of course, they instantly become popular.

8. Ivy marries a dying Raj (Season 3, "To the Future!")
Ivy (Gillian Zinser) starts dating Raj (Manish Dayal), who has terminal leukemia. When his diagnosis gets worse, Ivy says she's in it for the long haul, so Raj proposes and they get married in an extravagant Indian ceremony on the beach. They later break up and Raj ultimately dies.

9. Annie becomes a prostitute (Season 4, "Greek Tragedy")
When Annie is struggling to pay her sorority dues, a friendly sister invites her to come out and dine with rich friends. Turns out the friends are paying for their company. While disgusted at first, Annie realizes that she can now pay her dues and have money to spare. Her next escort date becomes a "boyfriend," and even though Annie discovers that he's cheating on her, she continues the "relationship" to pay for Dixon's rehab.

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10. Navid goes undercover in his uncle's car theft ring (Season 4, "Benefit of the Doubt")
Navid finds out that his uncle Amal is actually operating a car theft ring at Shirazi Studios and threatens Silver when Navid says that he's going to rat him out. Because of lack of evidence, Navid goes undercover for the cops, but he is beaten up in the process and gets hospitalized. Silver later gets Navid's dad to return from hiding (due to filming underage pornography) and turn himself and Amal in.

11. Silver dates the adoptive father of Adrianna's biological daughter (Season 4, "Trust, Truth and Traffic")
What are the chances that Silver's new boyfriend has a daughter who also happens to be Maisy, the girl Adrianna gave up for adoption? After Navid realizes this, he tells Ade, who pretends to be Silver and picks her up from school so she can spend time with her. Greg (Niall Matter), the guy Silver (Jessica Stroup) is dating, recognizes Adrianna when she and Silver bring her home and is furious that she got involved and breaks up with Silver.

12. Dixon ends up in a wheelchair (Season 4, "Forever Hold Your Peace")
In an effort to reconcile with Adrianna before she leaves for her tour, Dixon hitches a ride back to town but is sideswiped by a massive truck. Dixon is in the hospital at the start of the following season and soon recovers enough to leave in a wheelchair. During a therapy session, he connects with a girl named Meghan (Jessica Parker Kennedy), who's mourning the loss of her father. Dixon realizes that her dad was the truck driver who hit him. The two end up dating briefly, and Dixon is able to walk again.

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13. Annie gets shot (Season 5, "Misery Loves Company")
On a mission to save Liam (Matt Lanter) from his stalker Ashley (Natalie Morales), Annie and Vanessa (Arielle Kebbel) find him tied up in a bowling alley. While Annie gets Liam free, Vanessa fights off Ashley, but before the police arrives, Annie jumps in to stop Ashley from shooting Vanessa and gets shot herself.

14. Silver uses a gestational carrier to have a baby with her gay best friend (Season 5, Episode "#realness")
After learning that she has the cancer gene, Silver decides to have a baby before it's too late. Her gay best friend Teddy (Trevor Donovan), whom she previously dated, agrees to be the father, but under the condition she uses a surrogate. Who's the surrogate? Teddy's boyfriend's sister Michaela (Lyndon Smith), who also had a one-night stand with Navid (Silver's ex). Unfortunately, Michaela suffers a miscarriage.

15. Annie falls in love with Dixon's physical therapist and then he dies (Season 5, "Here Comes Honey Bye Bye")
After getting off to a tense start, Annie falls for Riley (Riley Smith), Dixon's physical therapist who is paralyzed. The two break up, but after witnessing how happy Annie is about Dixon's recovery, Riley decides to undergo experimental surgery. When Annie wakes up from her coma (see: No. 9), she realizes that she loves Riley and rushes to see him. He's already had the surgery, but is recovering just fine in the hospital. The two kiss and say "I love you." But when Annie returns home that night, she gets a call that Riley has died.

What was your favorite crazy 90210 moment? Share yours below!

The 90210 series finale airs on Monday at 8/7c on The CW.