In the year 2024, the ozone layer is believed to have been destroyed, and it's up to MacLeod and Ramirez to set things right. Opposition comes from both the planet Ziest (MacLeod and Ramirez's homeworld) and a corporation profiting from the supposed lack of ozone. Also, flashbacks show the story behind MacLeod and Ramirez's exile from Ziest.

He fought his first battle on the Scottish Highlands in 1536. He will fight his greatest battle on the streets of New York City in 1986. His name is Connor MacLeod. He is immortal.