Determined to prove that Project Tic Toc was capable of sending humans through time, Dr. Tony Newman and Dr. Doug Phillips entered the project's time tunnel before final tests were completed. Now, caught in time and unable to return home, the two scientists battle to stay alive as the Vortex of Time thrusts them into the middle of some of the most significant events in world history. But even more important, as the time travelers encounter famous and influential people of the past, they must make sure their actions don't inadvertently change history and alter the future.