based on transformers: where alien robots can transform themselves into cars and drive on their own. in their robot mode they stand at 19" tall. They could either use their voice chip or the radio.

Story plot: you were In a junk yard when you see a rusty car. You dusted it off to see some type of symbol on the hood of the car. It seemed to be left behind. You opened the car door to see how it feels like inside. Not knowing you made a companionship.