The U.S.S. Enterprise crew takes on a Federation historian to investigates an ancient space station which has suddenly appeared in orbit of a planet that the crew has visited before. After they enter the space station, they soon realize that there is much more to the ancient complex than they expected.
Act I of this episode marked the first appearance of a second Constitution-class starship, the
U.S.S. Yorktown in the animated STAR TREK series.
This episode is a direct sequel to the original STAR TREK series episode "Requiem for Methuselah" (TOS) written by Jerome Bixby which originally aired on February 14, 1969.
This episode features the character of Flint the Immortal who was originally portrayed by late actor James Daly in "Requiem for Methuselah."
This episode is a sequel of sorts to the September 20, 1968 original series episode "Spock's Brain." because this story
is set on a space station orbiting planet Sigma Draconis VI which was the setting for that episode.
Act I and Act II features a cameo by a Starfleet female who bears a striking resemblance to Dr. Erica Lane from the animated
Fantastic Voyage television series which was produced from September 1968 to January 1969 by Filmation Assoc.
This episode establishes that Italian violinist, violist, guitarist and composer Niccolo Paganini (1782 - 1840) was in fact
Flint the Immortal in one of his hundred or so identities.
Another musician that was an identity used by Flint was Glenn Miller (1904 - missing 1944) American jazz musician,
arranger, composer and bandleader during Earth's swing music era. Miller went missing in 1944 and in this episode Flint
is elusive as to why he only spent twenty years as Glenn Miller.
Ship's historian Lieutenant Erickson was a major character of this new episode. He was first seen in "Yesteryear"
the September 15, 1973 second episode of the animated STAR TREK series written by Dorothy C. Fontana.
In Act I, Erickson mentions seeing Flint give a lecture at Roddenberry Center. This fictional large auditorium on Earth was
of course named after STAR TREK series creator Gene Roddenberry.
The transport ship S.S. Dierdre was referenced in this episode. The ship was first mentioned in the original series episode "Friday's Child" which aired in December 1967.