Philadelphia Experiment II

Nine years after his time travel, David Herdeg has settled in modern California as a husband to Allison and father to Ben. Allison has died, leaving him a single father facing a failing business and looming foreclosure. Ben's school attendance is slipping, and David endures painful episodes that Longstreet dismisses as stress.

Engineer William Mailer demonstrates his time-teleportation concept by beaming a model aircraft across a room. The demonstration draws interest from the project panel, but Longstreet urges caution and blocks backing the project. The testing also appears to trigger David's recurring episodes, linking Mailer's work to his symptoms.

David discovers that Longstreet lied about the project's direction and intends to rejoin the Navy only for the experiment. He decides to leave California to escape the danger surrounding the Philadelphia Experiment. His decision sets the stage for Mailer's escalating use of the technology.

Mailer pushes the device's boundaries by teleporting an F-117; the aircraft does not return. David endures a painful seizure as the world warps around him and Ben disappears from sight. The sequence reveals the dangerous consequences of uncontrolled time travel.

David wakes in an altered 1993, fleeing a heavily armed regime. He is rescued by Jess, a resistance leader, who reveals that Nazi Germany won the war and is about to impose fifty years of rule over America. The new timeline is marked by oppression, surveillance, and the collapse of previous freedoms.

A futuristic aircraft, the Phoenix, is used to drop atomic bombs on Washington, forcing Allied surrender. The Phoenix is revealed to be the F-117 used by Mailer, sent back in time with a nuclear payload; Mahler claimed invention but was ridiculed for not reproducing it. The destruction of the Phoenix-catalyzed timeline cements German dominance.

Longstreet, now leading a resistance cell, recruits David to travel back in time again to stop the Phoenix from being used. David's blood, a result of his previous time travels, grants him the ability to travel through time. The mission is to alter history and avert the Nazi victory.

The resistance attacks Mailer's base to reach the time machine, but David is captured in the ensuing struggle. Mailer seizes a vial of David's blood, increasing the danger and urgency of the pursuit. The chase pushes David toward another attempt at time travel.

David and Mailer arrive in 1943 on the eve of the Phoenix's mission. Mailer confronts his father, who tells him he has no son. The tense encounter foreshadows the clash that could erase both men from history.

David destroys the aircraft, then tries to escape through the time portal. Mailer wounds him, but David retaliates by shooting Mahler, triggering a paradox that erases Mailer from history. The timeline corrects itself as he returns to the present.

David crawls back into the portal and returns to a corrected 1993. He meets his son Ben at a Little League game and discovers Jess is now the mother of one of Ben's teammates. The altered history shows a new, more hopeful family life.