Frank da Vinci

While investigating the deaths of a research team on Psi 2000, the Enterprise is infected with a virus that causes crew members to behave irrationally.

After landing on planet M-113, the Enterprise is stalked by a creature which can assume the shape and form of anyone it chooses and which kills by removing the entire salt content of its victims' bodies.

A slippery con man and his three stunningly beautiful lady friends make a big impression on the Enterprise.

When the Enterprise encounters a mysterious spacecraft, Captain Kirk is forced to bluff his way out of a dangerous situation.

The Enterprise helps Charlie Evans, the lone survivor of a transport crash 14 years earlier, but he threatens the security of the ship when he exhibits strange and unusual powers.

Captain Kirk and Mr Spock beam down to the planet Janus IV following a distress call and discover that more than 50 workers there have been hideously slain by an unknown monster. When an important piece of machinery goes missing, Spock becomes convinced they are not dealing with a mindless beast.