TAS - 1x09 - Once Upon A Planet

The Enterprise returns to the shore leave planet where the crew once took shore leave. As with their previous visit, things go wrong when the illusions turn deadly.
http://memory-alpha.org/en/wiki/Once_Upon_a_Planet


TAS - 1x11 - The Terratin Incident

When a strange flash of light paralyzes the entire crew of the Enterprise, they begin to shrink. Kirk beams down to the nearest planet, Cepheus, and discovers a miniature race desperate to leave their volcanic homeworld.
http://memory-alpha.org/en/wiki/The_Terratin_Incident


TAS - 1x14 - The Slaver Weapon

A group of Kzinti divert the shuttle Copernicus and retrieve a newly discovered Slaver weapon.
http://memory-alpha.org/en/wiki/The_Slaver_Weapon


TAS - 1x15 - The Eye of the Beholder

Beaming down to a planet to search for the crew of a missing ship, the crew is captured by previously unknown aliens.
http://memory-alpha.org/en/wiki/The_Eye_of_the_Beholder


TAS - 1x18 - Bem

Ari bn Bem, an erratic observer from the planet Pandro, secretly watches the crew of the USS Enterprise to determine whether the Federation is ready to open diplomatic relations with his medically-advanced species.
http://memory-alpha.org/en/wiki/Bem