The voyages of the Star Ship Enterprise across man's final frontier - space!
Its mission: to explore strange new worlds, to seek out new life and civilisations, to go boldly where no man has gone before.
A freak of gravity propels the U.S.S. Enterprise into the past to become a 'UFO' of the 1960s.
Not the least of Captain Kirk's problems is to decide what on Earth can be done so that the captured fighter pilot can take his allotted place in history.