To save Earth from an alien probe, Kirk and his crew go back in time to retrieve the only beings who can communicate with it, humpback whales.

Director: Leonard Nimoy

Cast: William Shatner, Leonard Nimoy, DeForest Kelley, James Doohan, George Takei, Walter Koenig, Nichelle Nichols, Jane Wyatt, Catherine Hicks, Mark Lenard, Robin Curtis, Robert Ellenstein, John Schuck, Brock Peters, Michael Snyder