VIDEO : 'Avengers: Infinity War' Director Says Robert Downey Jr. Is Fantastic On Set

Avengers: Infinity War director Joe Russo can't help but praise Robert Downey Jr.

Russo was asked what it was like working with Downey on set.

The director didn't have a bad word to say.

"Robert's fantastic. Robert is really focused and he works incredibly hard. There's a reason he's the biggest movie star in the world: he's put in the work. He's awesome to have on set."