Episode:1x24
This Side of Paradise

Jack's Rating:

All of the Enterprise crew, except Captain Kirk, are exposed to spores that induce a feeling of euphoria and a desire to remain on the planet.

Features:
Stardate: 3417.3
Air Date: 03/02/67
Director: Ralph Senensky

Jack's Review
This is one of the most fun classic episodes in all three seasons. I remember seeing this one as a kid and being enthralled by the flower shooting the spores and laughing at the diatribe Kirk uses on Spock at the end....mutinous, disloyal, computerized half-breed indeed.

Episode:2x09
Metamorphosis

Jack's Rating:

The shuttlecraft Galileo, carrying Kirk, Spock, McCoy, and Federation Commissioner Nancy Hedford, is drawn to a small planet by a mysterious cloud, which turns out to be a creature that has been caring for shipwrecked warp drive inventor Zefram Cochrane.

Features:
Stardate: 3219.8
Air Date: 11/10/67
Director: Ralph Senensky

Jack's Review
The first appearance of Zefram Cochrane is one of the earliest episodes of the original series I remember seeing when I was a kid. In fact, I remember seeing the companion on screen and asking my step-dad what it was, which hooked me into watching the episode! I love this one because of Elinor Donahue as well - Ellie Walker from Andy Griffith! While her character is rather irritating (on purpose) the rather sweet ending more than makes up for that.

Episode:2x13
Obsession

Jack's Rating:

Kirk is obsessed with trying to kill a cloud-like vampire creature similar to one that killed Kirk's commanding officer, Captain Garrovick, 11 years earlier.

Features:
Stardate: 3619.2
Air Date: 12/15/67
Director: Ralph Senensky

Jack's Review
Around 2009, I finally grabbed all three seasons of TOS on DVD which enabled me to properly binge the series. This is one of the few that I had never seen in syndication. It's a great episode that adds some back-story to Kirk.

Episode:2x20
Return to Tomorrow

Jack's Rating:

On a long-dead planet, the Enterprise finds three disembodied entities who ask for assistance in constructing android bodies for their brains, but one of the entities tries to steal Spock's body instead.

Features:
Stardate: 4768.3
Air Date: 02/09/68
Director: Ralph Senensky

Episode:2x25
Bread and Circuses

Jack's Rating:

The Enterprise crew encounters the abandoned S.S. Beagle in orbit around Planet 892-IV, and beams down to find that its captain has introduced a Roman-like gladiator culture to the planet.

Features:
Stardate: 4040.7
Air Date: 03/15/68
Director: Ralph Senensky