Kirk, Spock, McCoy and a couple of red shirts beam down to the surface of a planet in answer to a fake distress call.
Extra-galactic beings commandeer the Enterprise in an attempt to return home.
Commander Riker is struck down by a deadly microbe which invades his central nervous system and attacks his brain.
A physicist works to destroy a cluster of particles threatening to destroy the universe.
An accident at a nuclear research facility creates a dimensional doorway in which aliens need to widen to invade our world. A scientist races to discover a way to reverse the damage and close the doorway.
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