When Superman zooms into outer space to destroy an asteroid hurtling towards Earth, he gets a terrific jolt and amnesia. Can he regain his memory and try again before a fragment of the asteroid strikes our planet?
An asteroid heads toward Earth and the government asks for Superman's help to stop it. Superman flies into space and impacts with it making it smaller but the impact also cause him to lose his memory.
He impacts back to Earth but he does not remember who he is and that he is Superman. Lois tries to help Clark remember while everyone is looking for Superman not knowing if he survived the impact with the asteroid.
Martha and Jonathan also arrive in Metropolis and try to help Clark regain his memory so that he can become Superman again and stop the fragment of the asteroid that is still heading to Earth. After several attempts, Clark manages to remember and flies into space once again to stop the asteroid, this time fully succeeded, saving the Earth.