Doug and Tony land 10 years in the future on the Mars Excursion Module during liftoff. Their extra 335 pounds of weight endanger the mission by putting it over the weight allowance. Everyone believes the time travellers are spies except one man, Harlow. They are forced to land on the moon for a refueling stop, but the ship crashes. One of the other men, Beard, kills Harlow. Beard is a spy. To further confuse matters, ten years in the past at Project TicToc, Beard and another spy, Brandon, are visiting the complex. Brandon sabotages the tunnel and then tries to escape, but Beard shoots his superior to bolster his own cover and his own role remains undiscovered. In the future, Doug and Tony manage to blow up the ""future"" Beard, but the MEM takes off without them. As they are stranded on the moon, their air running out, the Tunnel scoops them up and sends them on their way. (Copyright 2003 Steve Crow)

Tony and Doug are frozen in time, then a rather fey Merlin appears in the Project base. He takes the guys out of time and freezes them, commands them to do his bidding, then sends them on to 544 A.D., Cornwall England. They meet a young pre-King Arthur while fighting Vikings and on Merlin's behest team up with Arthur. The Vikings apparently kill Doug and capture Tony and Arthur. Tony escapes with Arthur and Doug is rescued by Merlin and Guienvere. When the Project staff are ready to recover Doug and Tony, Merlin intervenes because he needs them where they are. Tony and Arthur get recaptured and so does Doug when he goes to help. Guinevere gets captured too. One of the Vikings kills Arthur and a ""detained"" Merlin shows up and reverses time to save him. The guys escape again and Doug gets reinforcements which Merlin disguises as Vikings while Arthur and Tony rescue Guinevere. Everything works out and Arthur and Guinevere are to be married.