Doreen was a possible truck that Mater knew. Mater mentioned she looked like a jaguar, but she was a truck, and that he used to "crash into her just so's I could spoke to her.". However, Mater seemed to be in a daydream, so Doreen might only be a figment of his imagination.
- The scene where Mater talks with McQueen about her could be a possible reference to the scene in Finding Nemo when Marlin bumps into Dory and speaks to her.
- This is due to the fact the names Dory and Doreen are similar and Marlin and Mater sound identical too.