Star Trek IV: The Voyage Home

Star Trek IV picks up where the best-forgotten third movie finished. The crew of the recently destroyed Enterprise have decided to end their self-imposed exile on Vulcan and return to Earth in their commandeered Klingon ship to face the charges levied after their previous adventure.

When they arrive in the solar system, they see that their home planet is under attack by a mysterious probe, that Spock correctly realises is trying to communicate with it's earth envoys, humpback whales. However, no reply can be given, as the species was hunted to extinction in the mid 21st century.

Knowing that no response can be simulated and that to ignore the probe would mean the end of all life on earth, they use the Sun's gravitational pull to sling-shot themselves into 'time-warp' and return to the late 20th century to try and collect a couple of whales to repopulate the species in their own time.

When in the 1980's San Fransisco, they encounter (and solve) several problems: finding the whales is easy, as there are a pair in the Whale Institute, overseen by Dr Gillian Taylor (Hicks).

Getting them into the ship is harder, as it needs Scotty (Doohan) and McCoy (Kelley) to construct a whale tank. At the same time, the time travel has damaged the dilithium crystals essential for warp travel and these need to be fixed, so Chekhov (Koenig) and Uhura (Nichols) break into a US aircraft carrier to collect some nuclear material. Unfortunately, Chekhov is injured and needs rescuing from the hospital before they can go home.

At the last minute, Dr Taylor jumps aboard ship and the journey home begins. Will they be in time?