Five hundred years in the future, a spaceship comes across the shape-changing robot Jedikiah, floating in space. The captain, Rabowski, repairs it. In the present day, Stephen is trying unsuccessfully to develop a photograph of something he saw in hyperspace. Carol and Stephen jaunt into hyperspace to see if they can locate anything unusual. Back on the spaceship, Robowski shows Jedikiah his captive, Peter, whose telepathic abilities are being negated by an alien creature known as a Medusa. Jedikiah tricks Peter into operating Rabowski's Time Key, and they travel back to the Tower of London in the present day, and steal the Crown Jewels. When Carol and Stephen jaunt back to the Lab, they find that everyone is frozen.