Stardate: 3018.2
Original airdate: 10/27/1967
Writer: Robert Bloch & D.C. Fontana
Director: Joseph Pevney

Guest stars:

Antoinette Bowers       Sylvia,
Theo Marcus             Korob, Alein beings who command power to transmute matter and read minds, they came from a world without sensation and are exploring the galaxy to enter in peace. they are like 'feathers in the wind' without their mgjic wand, the transmutter.

Michael Barrier         DeSalle, left in command of the Enterprise

Jimmy Jones             Jackson, part of the initial landing party, returned to the ship dead.

Crew Appearences:
Kirk, Spock, McCoy
Uhura
Sulu, part of the initial landing party
Scott, part of the initial landing party
Chekov

STory:

Star Trek does Halloween! Beaming down to Pyris VII, Kirk, Spock and McCoy confront Sulu and Scotty, who have been transformed into zombies. Korob soon regrets his mistreatment of the crew and helps them try to escape. Sylvia becomes intoxicated with her new sensual abilities and wants to take over the galaxy with Kirk's help. Their mind reading abilities are not perfect beccause  they wanted the crew to think everything was normal so they could come into the galaxy unnoticed and in peace, but instead created a world that is more in tuned to Holloween, right down to black cats, witches, dungeons, skeletons, curses and wizards.
 

Pyris 7, uninhabited planet on the star charts, selected by Korob and Sylvia for settlement by their alien species from outside the galaxy.

Quotes:
"The man is dead." Mccoy
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"If we weren't missing 2 officers and a third one dead, I'd say someone was playing a eleborate trick or treat on us."
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"You will be swept away. You, your men, your ship, your worlds."

Catspaw: Star Trek's version of Dungeons and Dragons