Ep 7. Catspaw

When the USS Enterprise arrives at the remote planet of Pyris VII, Captain Kirk and his crew are immediately met with an unexpected visitor — a black cat that seems to vanish into thin air. Soon after, the crew receives a distress signal from two members of a landing party who were sent to the planet before their arrival. Kirk, Spock, and McCoy beam down to investigate, only to find that the landing party members have been killed and turned into mindless zombies.

As the trio explores the planet, they encounter a mysterious castle and are greeted by Korob and Sylvia, two powerful alien beings who claim to be the masters of the planet. The aliens, who take on the forms of humans and use their powers to manipulate matter and create illusions, demand that Kirk and his crew leave the planet immediately.

Despite their warning, Kirk remains determined to uncover the truth behind the landing party's death and the strange occurrences on the planet. Along with McCoy and Spock, Kirk finds himself embroiled in a dangerous game of cat and mouse with Korob and Sylvia, as they attempt to uncover their true intentions and escape their control.

As they delve deeper into the castle's mysteries, the crew discovers that Korob and Sylvia are actually part of a greater civilization known as the "Old Ones," a race that once ruled the galaxy and is rumored to hold untold power. The two aliens are attempting to obtain the Enterprise's advanced technology and knowledge to use in their quest for ultimate power.

As tensions rise, Kirk and Spock must use their wits and ingenuity to outsmart the cunning aliens and protect their ship and crew from harm. Along the way, they encounter witches and ghouls, as well as the reappearance of the mysterious black cat that seemed to be following them all along.

Ultimately, in a dramatic and suspenseful conclusion, Kirk and his crew must face off against the powerful Korob and Sylvia in a battle for the fate of Pyris VII and the entire galaxy.

Filled with intrigue, action, and supernatural elements, "Catspaw" is a standout episode of the second season of Star Trek, and a must-see for fans of science fiction and suspense.