Scotty, Bones and Kirk go to some planet to check out the ladies. Real juvenile, guys

Scotty has the hots for the belly dancer. He asks her if they can take a walk in the fog together.

The dancer was stabbed and Scotty was found next her body holding a knife. He says he doesn’t remember what happened.

To find out if Scotty murdered someone, they put him in a locked room alone with a woman so she can use a device to read his mind. They find her stabbed and Scotty doesn’t remember what happened.

They decide to use this lady’s powers to try to get to the bottom of it. She says words that no one understands. Thanks anyway, I guess

Then the lights go out for a few seconds and when they come back on the lady is murdered and in Scotty’s arms.

They get Scotty to a chair that can tell when he’s being honest. They find out it’s true that he has no idea what’s going on.

Then they just ask the computer what’s going on

Through a series of questions, they find out that it was this guy, and that he’s Jack the Ripper, who was actually some kind of life-form that feeds on fear, and can cause people to be unaware of his actions with his powers. Yeah that would’ve been a tough one to figure out on their own

Jack the Ripper leaves the body of the man that sounds like piglet and starts taking over the ship

Kirk decides to give the crew some kind of drug that makes it so they won’t be scared. It makes sense, but also makes for a weird climax that we can’t take seriously.

Eventually the get Jack the Ripper back into his body and beam him into space