Lois and Clark: The New Adventures of Superman S1E12 January 2, 1994
Superman needs to stop a giant asteroid from colliding with Earth, but when Superman collides with the asteroid, he gets amnesia. Clark goes at the Daily Planet with Lois, who is helping him with his ""new job"" and ""new friends"" that he can't remember. And Martha and Jonathan need to make Clark remember that he is Superman, otherwise, the ""still-alive"" asteroid will colide with the Earth.