Fifth big screen outing for the crew of the starship Enterprise. Kirk (William Shatner, who also directs and co-scripts), McCoy and Spock's shore leave is cut short when the latter's half-brother - Vulcan renegade Sybok - takes several important ambassadors hostage on the planet Nimbus. They race to the rescue, unaware that the kidnap is all part of Sybok's ploy to hijack the Enterprise and set out on a quest to discover the Supreme Being - God.

For their fourth big-screen outing the crew of the USS Enterprise abandon their usual 23rd century time frame for Earth in the year 1986. In order to save the planet from a rogue space probe in the future, Kirk (William Shatner), Spock (Leonard Nimoy), Bones (DeForest Kelley) and co must travel back to the twentieth century to find the only creature capable of communicating with it: a whale. The story is given comic treatment - Spock hides his Vulcan ears with a headband and poses as a burnt-out hippy, while the normally intrepid Kirk gets lost on a bus.