We must go back in time to stop those nuclear bombs before they go off ... doing nothing is not an option.
Nick (21st century) and Norina (25th century) travel in time, destined to save Earth from destruction. Dr. Dylos knows his team is unable to stop radiation from destroying the planet. The Du Bois brothers, and their cartel have a sinister plan for retaining their status on Earth and Mars. Nephos, an outlaw and ingenious man who manipulates robots, joins the cartel's team with Darna, a beautiful reporter; his love for Darna puts their team in danger. Tampering with the Prime Directive will cost them dearly and their past changes will alter the future of mankind and they will find their home an unwelcoming place in which to live. Probes reveal 30th century Earth is fighting a losing war with an alien species from the planet Voursa. The community of spaceship Anastrophe deciding to save Earth again goes to the aliens' planet, back in time before the aliens attack Earth. The Anastrophe community builds a larger spaceship, travels on a two hundred year odyssey and encounters unfriendly planets on the way, which puts their mission in peril.