Bill Blackburn

Only the Enterprise and the battered Constellation stand between an ancient weapon and devastation; guest William Windom.

The Enterprise discovers a remote world bearing an unlikely resemblance to 1920s Chicago; guest Vic Tayback.

Kirk discovers his old professor is responsible for establishing a Nazi society on a planet; guest Skip Homeier.

The Enterprise officers investigate a primitive society that seems to exist to serve a godlike machine; guest David Soul.

Capt. Kirk becomes obsessed with destroying a gaseous creature that was responsible for the death of his former captain.

While seeking a cure for a fever ravaging the Enterprise, Kirk and Spock encounter Flint, a hermit-like Earthman, and his beautiful young ward.