Collision

When both of their worlds combine, Lightning and Edna must get past their differences to save the worlds they call home. The 30 year old car and 16 year old human may have just the slightest difficulty getting along though.

The fine print: problems getting along with each other may include, Edna thinking talking cars are freaky, Lightning getting used to a human inside him, and them both relizing they are entirely different.
(I literally have no idea how Edna is supposed to even get in Lightning. Feel free to comment on how because I have a strange feeling it is near impossible. )