There, during a time that history seemed to forget, they encountered a group of anachronistic assailants who immediately attacked the team. Subdued and taken to their leader's throne room, the team was shocked to be spoken to in English and even more surprised to find out that the pharaoh, Rama-Tut, was also a time-traveler!
Their captor went on to explain that he hailed from the year 3000, which had widely established peace and prosperity. Bored and hungry for adventure, he took inspiration from historical videos of the FF themselves and began exploring. In his quests, he found plans for a time-travel device in an ancient castle that he used to build his own Sphinx-like chronal conveyance.
Upon crash-landing in Ancient Egypt, the man was blinded, but fired blindly at the nearby witnesses. In awe of his power, they made him their leader and even returned his sight with radioactive herbs.
Using his Ultra-Diode Ray, Rama-Tut managed to sap the Fantastic Four of their strength and kept them captive. Thanks to an unexpected transformation from the Thing into his more human form, Ben escaped his shackles and tipped a few dominoes, leading to their escape.
In the ensuing chaos, Rama-Tut took off in a time escape pod and the First Family returned home, but the time machine would not allow the radioactive herbs to make the journey. A few issues later, in FANTASTIC FOUR #23, Doctor Doom got launched into space—a plot point picked up in FANTASTIC FOUR ANNUAL (1963) #2 wherein Rama-Tut picked him up in his ship.