"Saved By The Bell" fans and former star Tiffani Thiessen got a big surprise on "Today" Tuesday morning.

Just before Thiessen, currently starring on USA's "White Collar," and "Today" anchors Natalie Morales and Willie Geist kicked off a game of TV trivia -- which featured a giant sign from The Max, "Saved By The Bell's" legendary hangout -- Dennis Haskins (Mr. Belding) came onto the set with his classic, "Hey, hey, hey. What is going on here?"

The "Saved By The Bell" reunion shocked Thiessen (who looked a little uncomfortable, perhaps because she's been avoiding a reunion for years), but it didn't derail the trivia game. Haskins alleviated Al Roker of his game show hosting duties so he could join Geist's team and the two battled against Morales and Thiessen.

Despite Thiessen's notorious avoidance of a "Saved By The Bell" reunion, Haskins told "Today" the real reason a reunion hasn't happened yet. “It’s not like something is holding it up -– I think it’s a matter of timing and finding something that everyone wants to do,” he said. “There’s some issues with Dustin [Diamond]. He wrote a book that wasn’t real positive.”

Watch the surprise "Saved By The Bell" reunion below:

Visit NBCNews.com for breaking news, world news, and news about the economy

Loading Slideshow...
  • Celebrities Arrive at Opening of Disney Theme Park

    385327 09: Actor Dennis Haskins arrives to a V.I.P. party on the eve of the public grand opening of ''Disney's California Adventure'' theme park, February 7, 2001 in Anaheim, CA. The 55-acre park next to Disneyland is based upon California themes of past and present. (Photo by David McNew/Newsmakers)

  • 2011 Kiehl's LifeRide For amfAR Finale

    NEW YORK, NY - AUGUST 06: Actor Mark-Paul Gosselaar attends 2011 Kiehl's LifeRide for amfAR finale at the Kiehl's Since 1851 Flagship Store on August 6, 2011 in New York City. (Photo by Cindy Ord/Getty Images)

  • 2011 Kiehl's LifeRide For amfAR Finale

    NEW YORK, NY - AUGUST 06: Actors Tiffani Thiessen and Mark-Paul Gosselaar attend 2011 Kiehl's LifeRide for amfAR finale at the Kiehl's Since 1851 Flagship Store on August 6, 2011 in New York City. (Photo by Cindy Ord/Getty Images)

  • Opening Celebration Of Kimberly McDonald Los Angeles

    WEST HOLLYWOOD, CA - JANUARY 10: Tiffani Thiessen attends the Opening Celebration Of Kimberly McDonald Los Angeles on January 10, 2013 in West Hollywood, California. (Photo by Jonathan Leibson/Getty Images for Kimberly McDonald)

  • Us Weekly's 25 Most Stylish New Yorkers Event

    NEW YORK, NY - SEPTEMBER 12: Actress Tiffany Amber Thiessen arrives to Us Weekly's 25 Most Stylish New Yorkers Event at STK Midtown on September 12, 2012 in New York City. (Photo by Anna Webber/Getty Images)

  • OCRF's 15th Annual Super Saturday hosted by Kelly Ripa, COVERGIRL Paula Patton, Donna Karan and InStyle.

    WATER MILL, NY - JULY 28: Tiffani Thiessen attends OCRF's 15th Annual Super Saturday hosted by Kelly Ripa, COVERGIRL Paula Patton, Donna Karan and InStyle at Nova's Ark Project on July 28, 2012 in Water Mill, New York. (Photo by Andrew H. Walker/Getty Images for Ovarian Cancer Research Fund)

  • Hanky Panky For Hello Kitty Launch Benefiting The Human Society Of The United States

    NEW YORK, NY - MAY 16: Tiffani Thiessen attends the Hanky Panky For Hello Kitty Launch Benefiting The Human Society Of The United Statesat Studio 450 on May 16, 2012 in New York City. (Photo by Astrid Stawiarz/Getty Images)

  • NBCUniversal's 69th Annual Golden Globes Viewing And After Party Sponsored By Chrysler And Hilton - Inside

    BEVERLY HILLS, CA - JANUARY 15: Actress Tiffani Thiessen arrives at NBC Universal's 69th Annual Golden Globe Awards After Party at The Beverly Hilton hotel on January 15, 2012 in Beverly Hills, California. (Photo by Jerod Harris/Getty Images for NBCUniversal)

  • MOCA Los Angeles Presents "Rebel" Exhibition Opening And Reception

    LOS ANGELES, CA - MAY 12: Actress Elizabeth Berkley attends the MOCA Los Angeles Presents 'Rebel' Exhibition Opening and Reception on May 12, 2012 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)

  • 2011 A Funny Thing Happened On The Way To Cure Parkinson's - Arrivals

    NEW YORK, NY - NOVEMBER 12: Elizabeth Berkley attends the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

  • The Candie's Foundation 2011 Event To Prevent Benefit Gala

    NEW YORK, NY - MAY 03: Elizabeth Berkley attends the Candie's Foundation 2011 event to prevent benefit gala at Cipriani 42nd Street on May 3, 2011 in New York City. (Photo by Andy Kropa/Getty Images)

  • Children Mending Hearts 3rd Annual "Peace Please" Gala -Red Carpet

    LOS ANGELES, CA - APRIL 16: Actress Elizabeth Berkley arrives at the Children Mending Hearts 3rd Annual 'Peace Please' Gala held at The Music Box at the Fonda Hollywood on April 16, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Children Mending Hearts)

  • Children Mending Hearts Gala - Red Carpet

    HOLLYWOOD - FEBRUARY 18: Actress Elizabeth Berkley arrives at the Children Mending Hearts Gala held at the House Of Blues on February 18, 2009 in Hollywood, California. (Photo by Jason Merritt/Getty Images for Children Mending Hearts)

  • Latino Inaugural 2013: In Performance At Kennedy Center - Arrivals

    WASHINGTON, DC - JANUARY 20: TV personality Mario Lopez attends Latino Inaugural 2013: In Performance at Kennedy Center at The Kennedy Center on January 20, 2013 in Washington, DC. (Photo by Rick Diamond/Getty Images for Latino Inaugural 2013)

  • Fox's "The X Factor" Season Finale News Conference

    LOS ANGELES, CA - DECEMBER 17: TV personality Mario Lopez attends Fox's 'The X Factor' season finale news conference at CBS Televison City on December 17, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

  • The Cinema Society & Grey Goose Host A Screening Of "Alex Cross"- Arrivals

    NEW YORK, NY - OCTOBER 18: Mario Lopez attends The Cinema Society & Grey Goose Host A Screening Of 'Alex Cross' at Tribeca Grand Hotel on October 18, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)

  • "Mega Python Vs. Gatoroid" New York Premiere

    NEW YORK, NY - JANUARY 24: Dustin Diamond attends the 'Mega Python vs. Gatoroid' premiere at the Ziegfeld Theatre on January 24, 2011 in New York City. (Photo by Theo Wargo/Getty Images)

  • Dustin Diamond Joins The Cast Of "The Awesome 80's Prom"

    NEW YORK - MAY 21: Actor Dustin Diamond joins the cast of 'The Awesome 80's Prom at Webster Hall on May 21, 2010 in New York City. (Photo by Stephen Lovekin/Getty Images)

  • Dustin Diamond 2007 Sundance Portrait Session

    PARK CITY, UT - JANUARY 20: Actor Dustin Diamond poses for a portrait during the 2007 Sundance Film Festival on January 20, 2007 in Park City, Utah. (Photo by Mark Mainz/Getty Images)

  • Lark Voorhies

    UNITED STATES - MARCH 19: Lark Voorhies (Photo by Time & Life Pictures/Getty Images)

  • Lark Voorhies

    UNITED STATES - MARCH 19: Lark Voorhies (Photo by Time & Life Pictures/Getty Images)

  • Lark Voorhies

    UNITED STATES - MARCH 19: Lark Voorhies (Photo by Time & Life Pictures/Getty Images)

  • Lark Voorhies

    UNITED STATES - MARCH 19: Lark Voorhies (Photo by Time & Life Pictures/Getty Images)

Related on HuffPost: