The finest cartoon series of all time and that's not so much an opinion as a universal truth.
However, it must have been the strangest pitch that Hanna-Barbera was ever party to:
'Right, so it's an animated take on the group dynamics and interplay popularised by Sgt Bilko, it also has the urban savvy and youth against authority feel of West Side Story. A gang living on their wits and working together towards a common goal.
Oh and did I mention that they're all cats?'