While exploring the universe in the year 2369, androids Fi and Fum penetrate a time warp and land in present day Earth,1975. Anxious to make new friends, they invite two earthlings, a boy name Jerry and his babysitter, Alice, aboard their space ship. Suddenly, as curious people begin to crowd around the alien craft, Fum is alarmed and activates the launch mechanism, sending the ship back into space, where they become lost in time. The stories are mainly about their adventures in strange, futuristic worlds, and Fi and Fum's attempts to return their unwilling passengers to Earth.