While conducting an experiment in time travel, scientists Dr. Tony Newman and Dr. Douglas Phillips find themselves whisked from time period to time period, while their colleagues back in the present desperately struggle to retrieve the two men. The pair frequently find themselves on the brink of a major historical event, and while the scientists back home can see the action unfolding wherever Newman and Phillips are, they are helpless to offer any aid.

Join the crew of the Seaview aboard their super high-tech submarine, where no mission is too dangerous and no threat is too deadly, be it enemy agents, mad scientists, deadly sea creatures, or impending nuclear disaster.