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I believe you are thinking of Thundarr the Barbarian.
"The year 1994, from out of space, comes a runaway planet, hurtling between the Earth and the moon, unleashing cosmic destruction. Man's civilization is cast in ruin. Two thousand years later, Earth is reborn. A strange new world rises from the old. A world of savagery, super science, and sorcery. But one man bursts his bonds to fight for justice. With his companions Ookla the Mok and Princess Ariel, he pits his strength, his courage, and his fabulous sun sword against the forces of evil. He is Thundarr the Barbarian!"