The Avengers Stars Reveal the Biggest Troublemaker on Set

We caught up with the cast of Avengers: Age of Ultron at Comic-Con to get the scoop on the next installment of the Marvel franchise. Plus, we asked Robert Downey Jr., Chris Evans, Chris Hemsworth, Elizabeth Olsen, and more who is the biggest troublemaker on set. Who do you think it is? Let us know in the comments! ubscribe to POPSUGAR Entertainment! Visit our website for more celebrity and entertainment news!