Question:  Steven Fonti worked on an episode of an American superhero animated television series created by who?

Context articles: The Itchy &amp; Scratchy &amp; Poochie Show
OK K.O.! Let's Be Heroes
Danny Phantom
Spider-Man (1967 TV series)
Freakazoid!
List of OK K.O.! Let's Be Heroes episodes
Apollo Gauntlet
Steven Universe
Steven Fonti
The Powerpuff Girls

"The Itchy & Scratchy & Poochie Show" is the fourteenth episode in the eighth season of the American animated television series "The Simpsons".
 It originally aired on the Fox network in the United States on February 9, 1997.
 In the episode, "The Itchy & Scratchy Show" attempts to regain viewers by introducing a new character named Poochie, whose voice is provided by Homer.
 The episode is largely self-referential and satirizes the world of television production, fans of "The Simpsons", and the series itself.
 It was written by David X. Cohen and directed by Steven Dean Moore.
 Alex Rocco is a credited guest voice as Roger Meyers, Jr. for the third and final time (having previously provided the character's voice in "Itchy & Scratchy & Marge" and "The Day the Violence Died"); Phil Hartman also guest stars as Troy McClure.
 Poochie would become a minor recurring character and Comic Book Guy's catchphrase, "Worst episode ever", is introduced in this episode.
 With "The Itchy & Scratchy & Poochie Show", the show's 167th episode, "The Simpsons" surpassed "The Flintstones" in the number of episodes produced for a prime-time animated series.
OK K.O.!
 Let's Be Heroes (also known simply as OK K.O.!)
 is an American superhero comedy animated series created by Ian Jones-Quartey (known for his work on "Adventure Time", "Steven Universe", "Secret Mountain Fort Awesome", and "Nockforce") for Cartoon Network.
 The show is based on his pilot short "Lakewood Plaza Turbo", which was released as part of Cartoon Network's 2013 Summer Shorts project.
 It is produced by Cartoon Network Studios.
Danny Phantom is an American superhero animated series created by Butch Hartman for Nickelodeon.
 It was produced by Billionfold Studios and distributed in Canada by Nelvana, a Canadian animation company.
 The series follows a teenage boy who, after an accident with an unpredictable portal between the human world and the "Ghost Zone", becomes a human-ghost hybrid and takes on the task of saving his town (and the world) from subsequent ghost attacks using an evolving variety of supernatural powers.
 He is aided in his quest by his two best friends, and later, his older sister, who for most of the series' run are among the only people who know of his double life.
Spider-Man is an animated television series in the superhero fiction genre.
 It was the original animated TV series based on the Spider-Man comic book series created by writer Stan Lee and designed by artist Steve Ditko, and was jointly produced in Canada (voice acting) and the United States (animation).
 The first two seasons aired on the ABC television network, and the third was distributed in syndication.
 Grantray-Lawrence Animation produced the first season, and seasons two and three were produced by Krantz Films in New York City.
 The show starred Paul Soles as Peter Parker (Spider-Man).
 The series ran from September 9, 1967, to June 14, 1970.
Freakazoid!
 is an American animated television series created by Bruce Timm and Paul Dini and developed by Tom Ruegger for the Kids' WB programming block of The WB.
 The series chronicles the adventures of the title character, Freakazoid, a manic, insane superhero who battles with an array of super villains.
 The show also features mini-episodes of adventures of other bizarre superheroes.
 The show was produced by Amblin Television and Warner Bros.
 Animation.
 The cartoon was the third animated series produced by the collaboration of Steven Spielberg and Warner Bros.
 Animation during the animation renaissance of the 1990s.
OK K.O.!
 Let's Be Heroes (also known simply as OK K.O.!)
 is an American superhero comedy animated series created by Ian Jones-Quartey (known for his work on "Adventure Time", "Steven Universe", "Secret Mountain Fort Awesome" and "Nockforce") and based on his pilot short "Lakewood Plaza Turbo", which was released as part of Cartoon Network's 2013 Summer Shorts project.
 As of September 29, 2017, 31 episodes of the series have aired.
Apollo Gauntlet is an American adult animated television series created by Canadian animator Myles Langlois, it follows the eponymous superhero as he fights evil in a futuristic medieval society.
 The series is produced by 6 Point Harness, Mosaic, and Williams Street.
 The series aired its pilot episode on December 4, 2016.
 Later, it premiered on Adult Swim on July 9, 2017.
Steven Universe is an American animated television series created by Rebecca Sugar for Cartoon Network.
 It is the coming-of-age story of a young boy named Steven Universe (voiced by Zach Callison), who lives in the fictional town of Beach City with the "Crystal Gems" – Pearl (Deedee Magno), Garnet (Estelle), and Amethyst (Michaela Dietz), three magical humanoid aliens.
 Steven, who is half-Gem, goes on adventures with his friends and helps the Gems protect the world from their own kind.
 It premiered on November 4, 2013 as Cartoon Network's first animated series to be solely created by a woman.
 Books, comics and a video game based on the series have also been released.
 When the series is in a hiatus, there would usually be multiple episodes airing after it concluded.
 The theme of the series is love and family as it is based on the creator's brother, Steven Sugar.
Steven Fonti also known as Steve Fonti (born June 16, 1970), is a Primetime Emmy Award winner who has worked in the Art Department on movies such as "Over the Hedge" and Adam Sandler's "Eight Crazy Nights", "", "Pooh's Heffalump Movie", "Osmosis Jones" and TV shows including "The Simpsons", "Family Guy" and "Futurama".
 He was also a writer and the storyboard director for Nickelodeon's animated series, "SpongeBob SquarePants".
 He also worked on an episode of "The Powerpuff Girls" called "Catastrophe".
The Powerpuff Girls is an American superhero animated television series created by animator Craig McCracken for Cartoon Network.
 The show centers on Blossom, Bubbles, and Buttercup, three girls with superpowers, as well as their father, the brainy scientist Professor Utonium, who all live in the city of Townsville.
 The girls are frequently called upon by the town's childlike and naive mayor to help fight nearby criminals using their powers.