When a mysterious object crashes to Earth, a group of seemingly unconnected strangers die from the energy pulse, but then awaken to learn that they have been assigned the task of preventing the impending Apocalypse.
Set fifteen years in the then-future year 1983, the series tells the tale of the crew and passengers of a sub-orbital transport ship named Spindrift. In the pilot episode, the Spindrift is en route from Los Angeles to London, on an ultra-fast sub-orbital flight. Just beyond Earth's boundary with space, the Spindrift encounters a magnetic space storm, and is dragged through a space warp to a mysterious planet where everything is twelve times larger than on Earth, whose inhabitants the Earthlings nickname "the Giants". The Spindrift crash-lands, and the damage renders it inoperable.
Years ago, the Taelons came to Earth, offering friendship and technology to humanity. But there are those who believe the Taelons have more sinister motives.
Set in the years 2063–2064, the show focuses on the "Wildcards", members of the United States Marine Corps Space Aviator Cavalry, 58th Squadron. They are stationed on the space carrier USS Saratoga, and act as infantry and pilots of SA-43 Endo/Exo-Atmospheric Attack Jet fighters.
The Invaders, alien beings from a dying planet. Their destination: the Earth. Their purpose: to make it their world. David Vincent has seen them, for him it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the Invaders are here, that they have taken human form. Somehow he must convince a disbelieving world that the nightmare has already begun.