Question: Ryan Stiles was a performer on the improvisational show that premiered on April 11, 2011 on what network?

Context paragraphs:
Sponk!: Sponk!  is a children's television game show, which premiered on American network Noggin September 10, 2001 and ran until March 3, 2002.  After the last episode aired, the show went in reruns until January 1, 2003.  The premise of "Sponk!"  was improvisational comedy, similar to the show "Whose Line Is It Anyway? " Two teams of performers depicted suggestions in a variety of games.  Viewers suggested their ideas by submitting them to the Noggin website.  "SID" (Suggestion & Idea Distributor) was the name of the computer on the show that picked the ideas submitted by Noggin.com members.  In 2002, the series was also broadcast to the on The N, a network targeted at the "tween" demographic of children approximately 9- to 14-years-old.

Martin Dempsey: Martin Edward Dempsey (born March 14, 1952), sometimes known as Marty Dempsey, is a retired United States Army general who served as the 18th Chairman of the Joint Chiefs of Staff from October 1, 2011 until September 25, 2015.  He previously served as the 37th Chief of Staff of the Army from April 11, 2011, to September 7, 2011.  Prior to that, he served as Commanding General, U.S. Army Training and Doctrine Command, from December 8, 2008, to April 11, 2011, as Acting Commander, U.S. Central Command, from March 24, 2008, to October 30, 2008, as Deputy Commander, U.S. Central Command, from August 2007 to March 23, 2008, and as Commanding General, Multi-National Security Transition Command – Iraq (MNSTC-I), from August 2005 to August 2007.  Dempsey assumed his assignment as Chairman of the Joint Chiefs of Staff on October 1, 2011 and stepped down from the Chairmanship on September 25, 2015.  He now serves as a professor at Duke University.

List of We Bare Bears episodes: "We Bare Bears" is an American animated television series on Cartoon Network.  Created by Daniel Chong and directed by Manny Hernandez, it follows the adventures of three adopted anthropomorphic bears, Grizzly, Panda and Ice Bear (voiced respectively by Eric Edelstein, Bobby Moynihan, and Demetri Martin), as they navigate life among humans in San Francisco.  The first six episodes of the series were aired during the final week in July 2015, starting on July 27.  The network approved a second season in August of the same year.  The first season ended on February 11, 2016, and the second season premiered on February 25, 2016.  The series was renewed for a third season on October 25, 2016 which premiered on April 3, 2017 and the second season ended a week later on April 11, 2017.  The third and second season episodes also alternated between each other for the first two weeks of April.

Ryan Stiles: Ryan Lee Stiles (born April 22, 1959) is a Canadian-American actor, comedian, producer and director whose work is often associated with improvisational comedy.  He is best known for his career and co-production work on the American and British versions of "Whose Line Is It Anyway?"  and the role of Lewis Kiniski on "The Drew Carey Show".  He played Herb Melnick on the CBS comedy "Two and a Half Men" and was a performer on the show "Drew Carey's Improv-A-Ganza".

Pilot (The Drew Carey Show): "Pilot" is the first episode and the series premiere of the American sitcom "The Drew Carey Show".  It first aired on September 13, 1995 on the ABC network in the United States.  The premise of the show revolves around the life Drew Carey would have lived if he had not become a stand-up comedian.  The pilot introduces the main characters of Drew (Carey), Kate (Christa Miller), Lewis (Ryan Stiles) and Oswald (Diedrich Bader), as well as Drew's workplace, the fictional Winfred-Lauder department store, and enemy Mimi Bobeck (Kathy Kinney).

Peter Girard: Peter Frank "Pete" Girard (May 5, 1918 – February 12, 2011) was a United States Army Air Corps pilot, Chief Engineering Test Pilot for Ryan Aeronautical, and the first man to hover in jet vertical flight.  This feat was accomplished November 24, 1953 during tests that would culminate in the development of the Ryan X-13 Vertijet.  He would later accomplish the first full-cycle vertical takeoff, horizontal flight, and vertical landing in a jet aircraft on April 11, 1957 at Edwards Air Force Base.  Prior to working with Ryan, Girard had worked at Curtiss-Wright in St. Louis, Missouri and served in the United States Army Air Corps during World War II as a Consolidated B-24 Liberator pilot.

Drew Carey's Improv-A-Ganza: Drew Carey's Improv-A-Ganza is an improvisational comedy television program that aired in the United States on the Game Show Network.  The program was hosted by Drew Carey and was produced at the Hollywood Theatre at the MGM Grand in Paradise, Nevada.  The show premiered on April 11, 2011 at 8 p.m. EST.

Drew Live II: "Drew Live II" is the fifth episode of the sixth season of the American sitcom "The Drew Carey Show", and the 132nd overall.  It first aired on November 8, 2000 on the ABC network in the United States.  The episode's plot sees Drew (Drew Carey) open an employment agency, but he has trouble finding jobs for his friends Lewis Kiniski (Ryan Stiles) and Oswald Lee Harvey (Diedrich Bader).

Love Triangle (game show): Love Triangle is an American dating themed game show–talk show crossover broadcast by Game Show Network.  Hosted by Wendy Williams, the show premiered on April 11, 2011 and aired its final episode on August 28, 2011.

Karelasyon: Karelasyon is a Philippine weekly drama anthology television series broadcast by GMA Network and produced by GMA News and Public Affairs.  The show premiered on April 11, 2015 on the network's "Sabado Star Power" block and aired worldwide via GMA Pinoy TV.  It aired every Saturday afternoon.  Hosted by Carla Abellana, the show features stories about real-life couples facing different challenges in their relationships.  The final episode aired on May 13, 2017.

Supporting paragraphs: Ryan Stiles Drew Carey's Improv-A-Ganza
Answer: Game Show Network