Lt. Gabler is seen here for what will be the first of four apperances. However, due to color errors, he appears as Caucasian although all of his subsequent appearances establishes confirm the character is African-American.
Trivia: Kirk's reference to having said "I will not kill today" is from the original series episode "A Taste of Armageddon."
Kirk: Spock, what did you perceive?
Spock: The wonders of the universe, Captain. Incredible, completely incredible.
Kirk: Am I doing the right thing, Bones? Once I said "man rose above primitiveness by vowing 'I will not kill today.'"
Spock: The brain could be completely destroyed if we convert the entire ship to energy aimed at the brain's cortex and expend the energy in one mortal strike.
McCoy: That sounds like you're telling us to blow up the ship.
Spock: I believe that is what I just said, Doctor.
This episode along with "Mudd's Passion" was released on The Animated Adventures of Gene Roddenberry's Star Trek: Volume 4 for VHS.
First speaking appearance of Lt. Arex (James Doohan). He is seen in the background in "Beyond the Farthest Star" but has no dialogue.
The shots of colony life come from the animated series Lassie's Rescue Rangers.
Marc Daniels directed many original Trek episodes, but this appears to be the only episode of original or animated Trek that he wrote. One of the episodes he directed was "The Doomsday Machine" which also featured a giant planet-killing object.
The character of Robert Wesley was previously introduced in the Original Trek episode "The Ultimate Computer," where he was the commodore in charge of the battle exercises. However, actor Barry Russo did not reprise his role for this episode.
Referencing the 1942 British war film One of Our Planes is Missing, which tells the tale of six British airmen who are shot down in the Nazi-occupied Netherlands and are forced to escape the country with the aid of sympathetic Dutch citizens.