Question: Ben Caldwell contributed to what animated television series which was produced by Warner Bros and animated and aired on Cartoon Network?
Context: The Problem Solverz is an American animated television series that aired on Cartoon Network.  Created by Ben Jones, it follows Alfe, Horace, and Roba, a group of detectives in their troubled town, Farboro.  The aforementioned characters were designed while Jones attended college in the 1990s; he later founded the art collective Paper Rad with Jessica and Jacob Ciocci.  The characters were featured in Jones' and the collective's animations and comics before the creator pitched a pilot to Adult Swim featuring the trio.  The network's executives referred Jones to Cartoon Network, who commissioned a series featuring the same characters.  The series was produced in Adobe Flash, with around fifteen animators employed at Cartoon Network Studios and the co-production of Mirari Films. Loonatics Unleashed is an American animated television series produced by Warner Bros.  Animation that ran on the Kids' WB for two seasons from 2005 to 2007 in the United States, Teletoon in Canada, Kids Central (now known as Okto) in Singapore, Cartoon Network's Boomerang in Australia, Cartoon Network in the UK, Italy, Southeast Asia and Latin America, and Canal 5 in Mexico.  It is still broadcasting in reruns on the Clan channel of the Televisión Española network in Spain. Ben Caldwell (born 1973) is a cartoonist who has worked in a variety of art and design fields over the past decade, including toy design, animation development, children's book illustration, and comic book illustration.  Most of his work has been for DC Comics, ToyBiz, on projects including "The Lord of the Rings", "Spider-Man", "X-Men", World Championship Wrestling, and "Harry Potter".  He has contributed to Justice League Unlimited covers, Wonder Woman children's books, and "" comic art.  His most widely known work is the Action!  Cartooning series of 'how-to' books, while his "Dare Detectives" comic, nominated for the Russ Manning Award for Most Promising Newcomer in Cartooning in 2005, has received less commercial and critical attention. Acme Hour is a former programming block that aired on Cartoon Network.  The block was a compilation of various Warner Bros., MGM, Jay Ward, Walter Lantz, Popeye, Felix the Cat, and public domain Betty Boop cartoon shorts.  It aired for an hour (as per its title) on weekdays, and, on late-night Saturdays, it would air for two hours, often airing cartoons that would never be broadcast in the daytime due to content.  It was named "Acme Radio Hour" in 1995, but this was changed to "Acme Hour" at Cartoon Network's Powerhouse era.  While it no longer airs on the US version of Cartoon Network, "Acme Hour" is still a part of Cartoon Network in other countries.  Starting in 2005, the US version of Boomerang aired Acme Hour every day.  It has since been removed from the schedule. The Bob Clampett Show is an animation anthology television program which ran from 2000 to 2001.  Produced by the Cartoon Network, it features animated theatrical shorts from the Warner Bros. library that were animated or directed by Bob Clampett, as well as a selection of shorts from the "Beany and Cecil" animated television series.  It originally aired on Cartoon Network, then reran on Adult Swim due to the politically incorrect content of some of the shorts.  Twenty-six episodes were made in all. Justice League Unlimited (JLU) is an American animated television series that was produced by Warner Bros.  Animation and aired on Cartoon Network.  Featuring a wide array of superheroes from the DC Comics universe, and specifically based on the Justice League superhero team, it is a direct sequel to the previous "Justice League" animated series.  "JLU" debuted on July 31, 2004 on Toonami and ended with the episode aired May 13, 2006.  It was also the final series set in the long-running DC animated universe, which started with "" in 1992. Paul Dini ( ; born August 7, 1957) is an American writer and producer who works in the television and comic book industries.  He is best known as a producer and writer for several Warner Bros.  Animation/DC Comics animated series, including "Tiny Toon Adventures", "", "", "The New Batman/Superman Adventures", "Batman Beyond", and "Duck Dodgers".  He developed and scripted "Krypto the Superdog" and contributed scripts to "Transformers", "Animaniacs", "Freakazoid" and "Static Shock".  After leaving Warner Bros.  Animation in early 2004, Dini went on to write and story edit the popular ABC adventure series "Lost".  He has written a number of comic books for DC Comics, including "Harley Quinn" and "Superman: Peace on Earth".  October 2010 saw the debut of "Tower Prep", a new live action/drama series Dini created for Cartoon Network.  It was announced that after two decades of doing DC-related animated projects, Paul Dini has gone over to Marvel to serve as a writer and producer for "Ultimate Spider-Man" and "Hulk and the Agents of S.M.A.S.H.". Bunnicula is an American animated television series from Warner Bros.  Animation developed by Jessica Borutski, produced by Borutski and Maxwell Atoms, and distributed by Warner Bros.  Television.  It premiered on Cartoon Network and Boomerang on February 6, 2016.  It is loosely based on the children's book series by James Howe and Deborah Howe.  The show is a dark comedy about a vampire rabbit named Bunnicula who likes carrot juice instead of blood to strengthen up his super abilities in new paranormal adventures. The third season of the animated television series "Teen Titans", based on the DC comics series of the same time by Bob Haney and Bruno Premiani, originally aired on Cartoon Network in the United States.  Developed by television writer David Slack, the series was produced by DC Entertainment and Warner Bros.  Animation.  Sander Schwartz was tagged as the executive producer for the series.  This marks the last season of Teen Titans being aired on The WB Television Network, from September 2005 to December 2005, skipping insignificant episodes.  It also became the only season that the The CW did not re-air during the 2007–08 U.S network television season, as the first two seasons of the series only re-aired on Kids' WB. Right Now Kapow is an American animated sketch comedy television series produced by Warner Bros.  Animation for Disney XD.  It is the first collaboration between Warner Bros.  Animation and Disney.  The series premiered on September 19, 2016 and ended on May 31, 2017.  The series was created by Justin Becker and Marly Halpern-Graser, who previously worked on the Cartoon Network series "Mad".  Becker also worked on Adult Swim infomercials, and Halpern-Graser also worked on Cartoon Network's "DC Nation".  The series follows Dog, Candy, Ice Cream, Diamond, Plant, and Moon going on new adventures everyday...and find themselves in mischief.  Every episode of the series has 3 main parts in every 11-minute segment and other random shorts.  The series has a style of humor similar to Cartoon Network's previous series, "Mad".
Answer: Justice League Unlimited