When Lex Luthor gets elected US President, he uses the threat of an oncoming kryptonite meteor striking Earth as a rationale to frame Superman.

As the world mourns the death of the Man of Steel, new heroes emerge, each claiming to be the true Superman reborn. But when a deadly threat uses Superman's absence to target Earth, their powers are put to the ultimate test.

"The Last Son of Krypton" is the three-part series premiere of Superman: The Animated Series. It depicts the origin of Superman. Finding that the planet Krypton is about to explode and unable to convince the populace of his theory, scientist Jor-El sends his infant son to Earth.

Embittered by Superman's heroic successes and soaring popularity, Lex Luthor forms a dangerous alliance with the powerful computer/villain Brainiac, and vows to defeat the defeat the Man of Steel.