VIDEO: Neil Patrick Harris Dances, Sings, Raps & Ziplines in BEST TIME EVER Season Finale!

Below, check out highlights from last night's season finale of "Best Time Ever with Neil Patrick Harris" with guest announcer Kelsey Grammer.

To open the show, Neil Patrick Harris filled in as the 5th member of Backstreet Boys as the band brought out their classic dance moves to headline "Singalong Live" with their #1 smash, "I Want It That Way."

"Best Time Ever" pulled out all the stops for the finale "End of the Show Show!" NPH performed an original song written for the occasion recapping everything that happened this season - complete with ziplining through the audience, dancing, fire breathing, and a heartfelt thank you to the best crew ever, including Broadway choreographer Spencer Liff (HEDWIG AND THE ANGRY INCH)

Also in the episode - Apolo Ohno returned with Ticket to Slide live from outside the studio where 2 couples won a trip to Australia after hurling themselves down a giant oil coated inflatable slide; David Alan Grier and Michelle Kwan stopped by to help surprise an unsuspecting member of the studio audience, and one audience member got REALLY lucky winning every prize on the biggest "Get Lucky" board of the season.

Harris is a five-time Emmy Award winner, having earned four Emmys as executive producer of the 2009 and 2011-13 Tony Awards, for which he also hosted. His other win came from his guest-starring role in a 2009 episode of "Glee." Harris has also hosted two Emmy Awards as well as the 2015 Academy Awards.

Harris, who recently concluded his run as the womanizing Barney Stinson in the hit comedy series "How I Met Your Mother," first gained notoriety on the small screen as the much-adored title character in "Doogie Howser, M.D." Created by Steven Bochco and David E. Kelley, the series ran for four seasons and told the story of a brilliant young DOCTOR WHO faced the problems of being a normal teenager.

A veteran of the theater, Harris most recently originated the role of Hedwig, the transgendered rock goddess, in the Tony Award-winning Broadway production of John Cameron Mitchell and Stephen Trask's landmark 1998 rock musical "Hedwig and the Angry Inch." His role as Hedwig earned him the Tony Award for Best Performance by an Actor in a Leading Role in a Musical in addition to Drama League, Drama Desk, Broadway.com Audience Choice awards and Outer Critics Circle and Astaire award nominations. Harris has starred in three additional Broadway productions, including the dual roles of the Balladeer/Lee Harvey Oswald in Sondheim's Tony Award-winning musical "Assassins." He made his Broadway debut as Anne Heche's unexpected suitor in the Pulitzer Prize-winning production of "Proof" and later starred as the exuberant emcee in "Cabaret" at Studio 54.

Additional theater credits include the Hollywood Bowl's production of "Amadeus," the Geffen Playhouse production of ARTHUR Miller's "All My Sons," "tick, tick...BOOM!" at London's Menier Chocolate Factory, "The Paris Letter" at the Kirk Douglas Theatre, the concert production of "Sweeney Todd" with the San Francisco Symphony Orchestra, "Romeo & Juliet" at the Old Globe Theater and the L.A. production of "Rent," which garnered him a Drama Desk Award.

Harris made his musical directorial debut with the 2010 Hollywood Bowl's staging of "Rent," starring Nicole Scherzinger, Vanessa Hudgens and Wayne Brady. Harris most recently directed the highly acclaimed and intimate illusion show "Nothing to Hide," featuring award-winning magicians Derek DelGaudio and Helder Guimarães, at the Geffen Playhouse and which later opened at the Pershing Square Signature Center in New York in 2013.

Photo credit: Viriginia Sherwood/NBC