Nicktoons is a franchise of television cartoon shows that are produced by and aired on Nickelodeon. Prior to 1991, animated fare on Nickelodeon comprised mostly of reruns of older cartoons or foreign-made series. The idea for their original Nicktoons programming on the network began in the late 80s, after successes with game and variety shows. Starting in 1989, profits from those programs funded "Nicktoons", with the first three cartoons (Doug, Rugrats and The Ren & Stimpy Show) aired on Sunday, August 11, 1991. This format was repeated every Sunday, eventually leading to the Nicktoons gaining more prominence on the network in the coming years with its most popular ones being Rugrats, SpongeBob SquarePants, The Fairly OddParents, Jimmy Neutron, Danny Phantom, All Grown Up!, Invader Zim, Teenage Mutant Ninja Turtles, The Loud House and Avatar: The Last Airbender.