Robert Downey Jr feels like Scarlett Johansson`s brother

London: ‘Sherlock Holmes’ star Robert Downey Jr feels like a big brother to his ‘Avengers Assemble’ co-star Scarlett Johansson.

The 46-year-old actor has previously worked with the 27-year-old actress ‘Iron Man 2’ and he sees her as a sister, reported Contactmusic. "I feel like a big brother to Scarlett and Chris Hemsworth has the whole package. Jeremy Renner is a serious actor who doesn`t take himself seriously at all," he said. The actor is reprising his role of Tony Stark and his alter ego Iron Man, who he played in the 2008 movie of the same name and its 2010 sequel in the forthcoming film. PTI