Academy Award winner Sandra Bullock plays Dr. Ryan Stone, a brilliant engineer on her first shuttle mission, with veteran astronaut Matt Kowalski (George Clooney). But on a seemingly routine spacewalk, disaster strikes. The shuttle is destroyed, leaving Stone and Kowalski completely alone - tethered to nothing but each other and spiralling out into the blackness.
The deafening silence tells them they have lost any link to Earth... and any chance for rescue. As fear turns to panic, every gulp of air eats away at what little oxygen is left.