- Directors: David Winters, Neal Sundstrom
- Producers: David Winters
- Writers: Ian Yule
- Genres: Action, Adventure, Romance, Sci-Fi
- Actors: Reb Brown, Cissy Cameron, Cameron Mitchell, James Ryan, John Phillip Law, Graham Clark, Billy Second, Rufus Swart
The Southern Sun is a seedship, or a spacefaring vessel that contains large amounts of people, whose mission is to colonize a new world. Its voyage has lasted generations, so many of its inhabitants have been born and will die without ever setting foot on solid ground. This does not please the antagonist, Elijah Kalgan, who conspires with the pirates infesting the nearby Corona Borealis system and the shipâ€™s Chief Engineer MacPhearson. Kalgan hatches a plot to disrupt the Southern Sunâ€™s navigation systems and use the Enforcers, the shipâ€™s police force, to hijack the ship and direct it towards this system. At this point, the inhabitants of the Southern Sun will have no choice but to accept his â€œgenerosity.â€
Kalgan sabotages a key part of the ship just as an important professorâ€™s shuttle is on a landing trajectory. The loss of guidance control causes the ship to explode. The shipâ€™s pilot, Dave Ryder, is able to escape, but the professor dies in the explosion. This sabotage seals off the flight deck for a number of weeks, which gives Kalgan the opportunity to attempt to wrest control. With the Enforcers in his hand, and with the flight deck out of commission, he holds the entire population of the Southern Sun hostage. Commander Jansen and Captain Devers enlist Ryderâ€™s assistance, aided begrudgingly by Jansenâ€™s daughter Dr. Lea Jansen, to regain control of the ship.