Message from Insomniac Games
"Following Up Your Arsenal, we entertained the idea of putting our heroes on a singular planet. The design revolved around a global conflict between two alien races and we thought it could be interesting if Ratchet and Clank had differing ideas about the war. Eventually the project changed direction to become Ratchet: Deadlocked, although the idea of one planet stayed with us and reemerged in All 4 One."
- Ratchet & Clank - 10 years of concept art on the Insomniac Games website.