OMG! This Saved by the Bell reunion is out of this world!

An almost-complete Saved by the Bell cast got back together on Wednesday, Feb. 4 courtesy of Jimmy Fallon who is making the most of his week filming NBC's The Tonight Show in Los Angeles.

Playing himself, Fallon stepped back to the '90s to join Mark-Paul Gosselaar (Zack), Tiffani Thiessen (Kelly), Mario Lopez (Slater), Elizabeth Berkley (Jessie) and even Dennis Haskins (Mr. Belding) for a totally amazing sketch set at Bayside High as the students prepare for a school dance.

Receiving a screaming ovation from the audience, Gosselaar was the first star to appear, quickly followed by Berkley, with a head of amazing curls, and Lopez, who swiftly shed his clothes to reveal a skintight black unitard!

The sketch featured a range of awesome '90s memorabilia, including brick-sized cell phones and fabulous fashion statements. But it was the throwback in-jokes that make this sketch so glorious!

Lopez poked fun at his ballet skills while Berkley relived her "I'm So Excited" caffeine pill freak-out moment!

And getting in on the jokes, Fallon announced to his new pals that he'd be leaving them to head to New York where he hoped to become a comedian, star in Saturday Night Live and "maybe one day date Nicole Kidman," referencing the recent on-screen hilarious revelation that the Australian singer had been romantically interested him.

"Jimmy going on a date with Nicole Kidman is like Jessie becoming a stripper,” Goselaar said, referencing Berkley's role in Showgirls.

Finally, Thiessen made her appearance, looking just like Kelly, except for one unexpected addition — her baby bump (Thiessen and husband Brady Smith recently announced they were expecting their second child)!

The only noticeably missing characters in the reunion were Lisa (played by Lark Voorhies) and Screech (played by Dustin Diamond, who was recently arrested for allegedly stabbing a man in a bar).

Watch the whole, amazing, sketch above — we guarantee you won't regret it!