Michael Dorn, Actor-Director-Star Trek: The Next Generation-ENCORE - Storybeat with Steve Cuden:

Michael has appeared more times as a regular cast member than any other Star Trek actor in the franchise’s nearly 55-year history, spanning some 272 TV episodes and 5 feature films. He also appeared as Worf’s ancestor, Colonel Worf, in the film Star Trek VI: The Undiscovered Country.