Professor Wedgwood (Peter Williams) must choose who will attempt the return voyage to Earth and who must remain behind. He decides that the best person to attempt the flight is Conway Henderson (Gerald Flood). He also sends his daughter Valarie (Gillian Ferguson).
His two sons Jimmy (Richard Dean) and Geoffrey (Stewart Guidotti) will remain on the Moon with him. The remaining crew, Dr. O’Connell (Harold Goldblatt), Professor Mary Meadows (Pamela Barney) and Ian Murray (Hugh Evans) will also stay behind. Everyone knows that there is a limited amount of oxygen left to sustain them.
Mary takes the waiting harder than Wedgwood does. Professor Wedgwood uses his remaining time to learn the alien language. Eventually Wedgwood reveals that there is a method to his madness. And it seems that madness is appropriate. Wedgwood hopes to learn enough to be able to pilot the alien spaceship back to Earth.
As miracles do seem to happen every episode, Wedgwood and the team get the alien spacecraft started and headed back to Earth. It doesn’t take long for them to catch up to MR-2. When the four hundred-million-year-old spacecraft hits the Earth’s atmosphere it breaks in two.
In MR-2, Henderson sees the ship break apart. Communication is down so he doesn’t know if anyone on the alien ship is still alive. Just in case, he mounts a daring rescue hoping that there are people on the other ship to save.
Each episode is normally about twenty-five minutes long. The last one, however, only ran for seventeen minutes. The reason for this was due to the television station airing the beginning of a new and unrelated series after the mid-episode commercial break.
In the frantic pace of the last episode the most memorable, not only of the episode but of the entire series, is an amazing spacewalk.
It’s unfortunate that “Target Luna” is lost. It would have been nice to see the whole spectrum of the four series. These series are very much like the old serials that showed in the local theaters on Saturday afternoons, complete with a sort of cliffhanger. The only difference is that the television series are six or seven episodes instead of twelve to fifteen chapters. They are both meant for children but can be enjoyed by adults, especially adults that first saw them as children.