Robert Downey Jr. Promises Loads of Action in 'Sherlock Holmes'

ET was in London to speak to the stars of the highly anticipated blockbuster 'Sherlock Holmes,' starring Robert Downey Jr. and Rachel McAdams. 

The Guy Ritchie-directed film, due to begin shooting this month, will feature Downey Jr. as famed detective Sherlock Holmes in a mystery that promises a fresh take on the classic Sir Arthur Conan Doyle character.

The movie will present Holmes as more adventurous and less formal than previous screen incarnations and Downey Jr. says he is excited to take on the new action-packed challenge, saying it promises to be "big and fun."