Billy Crystal has revealed that his Monsters University turn is more than just a voice role.
"If you're with a group like this, you know you're going to be in something spectacular and will be a part of something special. For me, getting to work with John live makes it more than an acting job," he said.
"I never think of it as a voice-over, I think of it as getting to be Mike again. We took off in the first movie, and we read in the same room. It just makes the comedy sing and the drama moments real. We don't even look at the script, we knew our lines."
He added: "I like the tender moments between the two of them. The moments of bonding and friendship are the ones I love the most."
Billy said playing Mike has given him some cred with his two granddaughters.
"They are excited. Once they saw me as Mike, I became the coolest guy. Well, one of the cooler guys," he said.