Robert Downey Jr.'s Tony Stark has been known to role in top-tier style when it comes to his cars, and the actor's appearance at a recent new unveiling for Audi's E-Tron GT has Marvel fans wondering if the new model might be popping up in Avengers 4. Here's Robert Downey Jr. unveiling the new Audi E-Tron GT : Speculation that the Audi E-Tron GT will be featured in Avengers 4 comes from the fact that Marvel Studios has a history of tying luxury car brands to their film releases.