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.