Actor Robert Downey Jr had a tough time shooting the second installment of the Iron Man franchise because he wanted it do better than the original film.
The first film made an impressive $585 million global haul at the box office and the cast was keen to have a similar success with the 'Iron Man 2', which hits theatres on May 7, Access Hollywood reported.
"It was really tough, I think, trying to get it right and more so, pretending that we could remember how we caught that lightning in a bottle," the actor said referring to the success of the first film.
"It was a very intuitive process last time."
However, the actor is no longer worried about the box office performance of the second film.
"My stress levels are at an all-time low because it's already gone well," he said.
The latest film brings together the original cast complete with superstar additions Scarlett Johnasson, Mickey Rourke, Don Cheadle and Sam Rockwell, Downey said he hopes the hard work everyone put into the project comes across on-screen.
"As a filmgoer and a film lover, I can tell I fell like when people have rested on their laurels or I can see where creative conversations went wrong or where somebody that didn't deserve it had too much power or say-so in something. I think we did alright."
The 'Sherlock Holmes' star said he returned for the sequel because of director Jon Favreau.
"We're like these dysfunctional brothers who only seem to be able to put their best foot forward when we are together. I just love the guy and I wouldn't be here if it weren't for him. And he definitely wouldn't be here if not for me," he said.