The Fairly OddParents - 1x05a - Father Time!

After accidentally destroying his father's prized childhood racing trophy with heat vision, Timmy travels back in time with his fairy godparents' Time Scooter to 1970's Dimmsdale to stop his father from winning the competition in the first place, but the subsequent changes to history erase Timmy from the future after Mr. Turner never marries his wife and grows up to become a "ruthless" dictator. Timmy must revert the changes to history himself, Cosmo and Wanda cannot grant wishes to a kid that doesn't exist!