The younger Martian character, 'Andy' was considered to be added to the cast if the series had been picked up for another season. The character became a part of the cast in the animated spin-off My Favorite Martians (1973).
Andromeda (a.k.a.Andy) had only antenna. Uncle Martin explain's that he lost the other as a baby.
The Martian spacecraft is reported to be traveling at 25,000 miles per hour. Even at that speed, it would still take over four months to reach Mars , which is over 77 million miles from Earth.
In this episode we learn Martin's complete native name: "Xigeous 12 1/2".
Martin says that his nephew from Mars was named Andromeda because he was born in the constellation Andromeda. However, the constellation Andromeda is 2.5 million light-years away. According to Einstein, nothing can travel faster than the speed of light, So even at that top speed, it would take 2 1/2 million years to reach the constellation Andromeda from our solar system, making it highly unlikely that the nephew's parents could have given birth to him there.