Kirk and the Enterprise must combat parasitic aliens.

Captain Kirk must learn the limits to the power of a 17-year-old boy with the psychic ability to create anything and destroy anyone.

The crew of the Enterprise become entangled in a planet’s tribal power struggle.

A selectively deaf woman named Mrs Richards insists that she has had a large amount of money stolen at the hotel, and against Sybil’s wishes Basil puts a fiver on…