Quicktime Crash-landing on a mountain side, THE VISITOR (formally Adam MacArthur) mysteriously emerges from the wreckage of the downed craft, seemingly unhurt. His sudden appearance creates a manhunt by opposing national security departments (including the FBI, headed by Douglas Wilcox, and the NSA, headed by Colonel James Vise), each with its own agenda to find out who Adam is, how he survived, and why he returned. It appears that Adam, missing in action since World War II, is still the young man he was 50 years ago prior to disappearing into the Bermuda Triangle. Adam eludes his pursuers by finding refuge with Nadine and Tyler Walden, a single mother and her 13-year-old son.

The FBI finally catches up to Adam and takes him to a federal prison for questioning. Meanwhile, Col. Vise experiences flashbacks of the experience that started his alien obsession. As they try to capture Adam, Michael O'Ryan discloses himself to Vise as his long lost friend.