Michael J. Fox and the rest of the 'Back to the Future' cast reunite at Fan Expo in Boston

Michael J. Fox and the cast of "Back to the Future" reunited at Fan Expo in Boston over the weekend.

Fox posted a photo on his Instagram account with the caption, "Back in 2018, even Biff made it."

The picture shows Fox with Thomas Wilson, Christopher Lloyd and Lea Thompson.

The cast held a panel discussion and signed autographs for fans.