Editor's note: It was announced in early April that Michael J. Fox is not able to attend Calgary Expo this year "due to unforeseen circumstances in his schedule."

Great Scott! Doc Brown, Biff and Lorraine are getting back together in present day Calgary.

The three cast members of Back to the Future — known to their friends and relatives as Christopher Lloyd, Tom Wilson and Lea Thompson — will be at the Calgary Expo on April 27.

The appearance includes a special presentation starting at 7 p.m. as well as autograph signings and photo ops.

Tickets for the event range from $20 for general admission, all the way to $1,099 for a backstage pass that includes a special photo op with all four actors, a guaranteed in-person autograph with one of the cast, a gold ticket to the event and a collectible badge.

Christopher Lloyd, left, as Dr. Emmett Brown, and Michael J. Fox as Marty McFly with the DeLorean DMC-12 car-turned-time-machine. (Universal Home Entertainment/Associated Press)

Fans of flux capacitors, hoverboards, white hair and near misses with their mother can get tickets starting at 10 a.m. on Feb. 8.