Tobot

While investigating a string of mysterious car accidents, Dr. Franklin Char is abducted by the perpetrators. This incident activates his creations called "Tobots", cars that transform into robots with a special key called a "Tokey". Dr. Char's first two Tobots, Tobot X and Tobot Y, are entrusted to his twin sons Ryan and Kory, respectively, to fight crime and protect their neighborhood.

(Source: Tabot Wiki)

Note: This season was recut into Season 1 Episodes 1-4 in the English release.