George Clooney has stepped in to replace Robert Downey Jr on Alfonso Cuaron’s long-awaited science-fiction film “Gravity”, says Heat Vision.

Sandra Bullock is the film’s lead.

Downey had been attached to the film – the story of a female engineer in Space – for quite some time but for numerous reasons, including the film’s delays, he recently exited the project.

Clooney’s role in the film is said to be small but pivotal.