00K9 made his first appearance in the animated urban story 'Spies in the Hood' in 2004.
In 2001 producer Brian Neil Hoff got the idea for the spy dog Secret Agent 00K9 when he looked out his kitchen window and witnessed what he thought was his dog Cosmo spying on the neighbor house.
In early 2007 voice roles in the animated comedy "Secret Agent 00K9" were offered to Miley Cyrus, Jim Carey, Robert Downy Jr. and the late Robin Williams.
Crime boss pit bull character Legs Diamond in the animated film Secret Agent 00K9 was modeled after the real Legs Diamond from the 20's and 30's. Originally created by concept artist Jasen Strong aka Alfie Vann in 2007.