After a global nuclear war on Earth, white man rockets over to a community of Black expatriates living on Mars and begs them to take in the remaining survivors. A Black resident convinces his town they need to prevent racism by segregating any white newcomers, but his wife implores him to think of their common humanity.

Extraterrestrial visitors promise solutions to America's financial, environmental, and energy problems - in exchange for the country's black citizens. A cultural struggle breaks out to determine whether the trade will be made.