Two scientists enter a “Time Tunnel” and become lost in time in Irwin Allen’s fantasy series, allowing them to visit historical events, like the Pearl Harbor attack, and even the future. An affiliation with 20th Century Fox allowed the producers to use film footage to add to the production values of the show.
The time travelers materialize in 1978 in a small New England town taken over by aliens, who plan to drain all the oxygen out of Earth's atmosphere.
Doug and Tony land in the desert during the historic 1883 battle of Khartoum just as a far greater battle against an alien race intent on destroying Earth begins.
When Ann is kidnapped, Tony and Doug follow the trail - only to find themselves up against a crazed alien scientist on a distant planet in the year 8433 A.D.
While Doug helps Marco Polo, Tony falls in love with a woman in 13th century Mongolia and decides to give up time traveling.
When the time travelers arrive in Gettysburg during the Civil War, Tony loses his memory and Doug encounters another man caught up in the time vortex - the philosopher Machiavelli.
Tony and Doug chase a tunnel saboteur through the Grand Canyon and through time, from 1547 to 1 Million A.D. and back to 1 Million B.C.
Tony and Doug are taken prisoners by pirates on the Barbary Coast in 1805 just as the American ships, which wiped out the pirates, launch their attack.
The time travelers arrive in Mexico in 1519 just as Cortez's army begins its deadly rampage through the country.
Tony and Doug find themselves taking part in one of the Bible's most well-known stories after they materialize outside the walls of Jericho.
The time travelers encounter the vengeful ghost of Nero when they are swept back to a villa in the Italian Alps during World War I.