Two scientists become trapped in a time machine.
EPISODE 1
Rendezvous With Yesterday
Two men (James Darren, Robert Colbert) enter a time tunnel which transports them into the past and future.
EPISODE 2
One Way to the Moon
Tony and Doug land in a spaceship bound for Mars, where their added weight endangers the crew; guest James T. Callahan.
EPISODE 3
End of the World
The time travelers try to convince a small town that Halley's Comet will not collide with Earth; guest Paul Fix.
EPISODE 4
The Day the Sky Fell in
Tony tries to save his father's life at Pearl Harbor on December 7, 1941; guests Sam Groom, Linden Chiles.
EPISODE 5
The Last Patrol
Gen. Southall (Carroll O' Connor) travels back to the War of 1812 to confront his ancestor and save Doug and Tony.
EPISODE 6
Crack of Doom
Natives decide to offer Tony and Doug as human sacrifices when they land on Krakatau as the volcano is about to erupt.
James Darren
Robert Colbert
Lee Meriwether
Whit Bissell
John Zaremba
Sam Groom
Sobey Martin
Irwin Allen
Bob Duncan