DreamWorks first announced they were moving forward with a Stone Age animated comedy back in 2005. At that time, the project was known as Crood Awakening and was being written by Monty Python co-founder John Cleese and DeMicco.
In a press release announcing The Croods cast, Co-President of Production for DreamWorks Animation Bill Damaschke said, "We are thrilled that Nicolas Cage and Ryan Reynolds are lending their considerable talents to The Croods and know that they will both bring a perfect blend of humor, enthusiasm and emotion to their lead roles. Our filmmakers are creating an amazing world that is full of fascinating characters, creatures and stunning environments that is truly unlike anything we've done before at DreamWorks Animation."
DreamWorks is aiming for a March 30, 2012 release.
The Croods Official Synopsis
Surviving in a volcanic world is tough enough, but caveman Grug (Cage) gets a rude awakening when an earthquake forces him to leave behind the only world he knows. With his family in tow, he ventures out into the volatile world in search of a new home. The situation becomes even more complicated when Grug's family - but in particular his eldest daughter - become smitten with a nomad (Reynolds) they encounter on their dangerous journey. This quirky, imaginative stranger's search for 'tomorrow' is at odds with Grug's reliance on the traditions of yesterday.Source: DreamWorks Animation


