Speed Racer (1967)

S1E41 The Car Destroyer

A man creates miniature cars that give him the power to manipulate actual vehicles, which he then melts down to construct a forest filled with robotic creatures. His motivation stems from a tragic incident where a hit-and-run driver left his son disabled. However, it is eventually uncovered that his son is capable of walking; the father has been keeping him confined to a wheelchair all along.