Star trek, in addition to spawning five successful TV series, has also lead to a whole series of nine films with the tenth coming out December 2002.

Star Trek:  The Motion Picture

A mysterious ship has been spotted on a direct course to earth.  admiral James T. Kirk has been returned the command of the newly refitted Starship Enterprise.  After trying to make contact with the life form.  It kidnaps and brainwashes one of the Enterprise's crew member's and turns it into a probe.  The Enterprise must now find out why the life form, V-Ger, is on a course for Earth and why, before it destroys the planet.

Star Trek II: The Wrath of Kahn

Admiral Kirk, while conducting training on the Enterprise, is sent on a mission to find out what has happened to the new Genesis project.  It turns out that Kahn Nooeien Soong has been found on an isolated planet and has stolen the Genesis missile in hopes of destroying Kirk.  Kirk tracks down Kahn and is able to destroy his ship however, in the process, Mr. Spock is killed and his body is sent down to the new Genesis planet.

Star Trek III:  The Search for Spock

After returning home from there mission with Kahn, Kirk is given notice that his ship is to be scrapped.  Also, Dr. Mcoy begins to show signs of insanity.  As it turns out, Mr. Spock has instilled his conscious in Dr. Mcoy.  Mr. Spock must be rejoined with his body, now on Genesis, to revive him.  Despite warnings, Kirk steals the Enterprise and is able to reunite Spock on his home planet.  However, this has come at a terrible price.  Kirk's son is killed by Klingons on the Enterprise is destroyed

The crew watches as Enterprise is destroyed.

Star Trek IV: The Voyage Home

The crew of the Enterprise is now on the planet Vulcan and decides to journey home.  While on route, they discover that Earth is being destroyed and the only way to save it is by bringing humpback whales back from the 20th century.  The crew travels back in time and is successful in bringing back the whales.  Because they saved the planet, all charges are dropped expect for one.  Kirk is demoted to captain and is given command of the new Enterprise-A 

Star Trek V: The Final Frontier

The Enterprise receives a distress call from the "Planet of Peace".  Upon arriving, they find that the planet has been take over by an insane Vulcan who is determined to reach the center of the Universe to find God.  This Vulcan, Sybok, steals the Enterprise and takes it to the center of the universe where they find not God, but an evil life form bent on escaping destroying everything.  The crew is able to destroy the life form and Captain Kirk goes back for more peaceful shore leave.

Star Trek VI: The Undiscovered Country

The Klingons have made a fatal error which threatens to destroy their home world.  This is the first sign of peace in many years.  Yet, there are some who would like to see these two worlds stay separate.  Captain Kirk, while escorting the Klingon leader, is framed for murder and Mr. Spock must stop the real killers before the kill the leader of the Federation and end this chance at peeve forever.

Star Trek: Generations

Captain Picard receives word that an evil scientist has been blowing up stars in an effort to enter an energy ribbon.  The Enterprise must now stop him before he destroys millions of lives.  The Captain tries to stop Soran but is sucked into the energy  he is now able to exit at any point in time to stop the scientist but the only way he can succeed is with the help of Captain Kirk who swept into the Nexus 78 years ago and presumed dead.  Captain Picard succeeds but Captain Kirk will never go on another mission.  

Star Trek: First Contact

The Borg, after eight years, have finally decided to attack Earth.  The Enterprise rushes to the planet to stop the ship.  However, before the crew can destroy the ship, it opens a time warp and travels into the past.  As the crew follows them, they realized that the Borg have changed history and taken over the planet.  The Enterprise, now in the past, must destroy the Borg before they destroy all of humanity

Star Trek: Insurrection

While on a diplomatic mission, the Enterprise receives word that commander Data is out of control.  THE crew discovers that Data, while on mission, has found a group of aliens are going to evacuate an entire planet and steal it's atmosphere, which will act as a fountain of youth.  Captain Picard must hen decide if he should follow his orders and stay away or if he should save a planet from total destruction