Using a device stolen from time-travelling researchers, Steve and Dan return to the day of the Spindrift's launch and try to alter history and stop the ill-fated flight.

Cast: Gary Conway, Don Matheson, Stefan Arngrim, Don Marshall, Deanna Lund, Heather Young, Kurt Kasznar, Bruce Dern, Yvonne Craig, Sheila Allen, Erik L. Nelson, Louise Lorimer, Martin Liverman, Marshall Stewart