Question: John Kassir had voiceover work for the Nickelodeon series produced by what company?

Context paragraphs:
Channels (film): Channels, released in 2008, is love story sometimes described as delving into thoughts of existentialism.  The film was written, directed, produced and acted in by Nat Christian.  The film stars Kim Oja, Nat Christian, Ed Asner, John Kassir, Joan Van Ark and Taylor Negron.  Ann Marcus executive produced.  The production company was Olliewood Films, Inc.

The Amanda Show: The Amanda Show is an American live action sketch comedy and variety show created by Dan Schneider that aired on Nickelodeon on April 4, 1999 as a pilot, then as a regular series from October 16, 1999 to September 21, 2002.  It starred Amanda Bynes, Drake Bell and Nancy Sullivan, and featured John Kassir, Raquel Lee, and Josh Peck.  The show was a spin-off from "All That", in which Bynes had co-starred for several years.  The show was cancelled at the end of 2002.  Writers for the show included Schneider, John Hoberg, Steven Molaro, and Andrew Hill Newman.

Adventure Time (pilot): "Adventure Time" is an animated short created by Pendleton Ward, as well as the pilot to the Cartoon Network series of the same name.  The short follows the adventures of Pen (voiced by Zack Shada), a human boy, and his best friend Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will.  In this episode, Pen and Jake have to rescue Princess Bubblegum (voiced by Paige Moss) from the antagonistic Ice King (voiced by John Kassir).

John Kassir: John Kassir (born October 24, 1957) is an American actor, voice actor and comedian.  He is known as the voice of the Crypt Keeper in HBO's "Tales from the Crypt" franchise.  Kassir is also known for his role as Ralph in the Off-Broadway show "Reefer Madness", as well as its film adaptation, as well as his voice over work as Buster Bunny (taking over for Charlie Adler late in the final season of "Tiny Toon Adventures"), Ray "Raymundo" Rocket on "Rocket Power", the mischievous raccoon Meeko in "Pocahontas" and its direct-to-video sequel, Jibolba in the "Tak and the Power of Juju" video game series, and the current voices of Pete Puma in "The Looney Tunes Show", and Deadpool in "" and the "" series.  He has also recently done the voice of Rizzo for the newest Spyro game, , and voiced Ghost Roaster in "", as well as Short Cut in "" and Pit Boss in "".  He is also known for his various roles in season 1 of "The Amanda Show".  He voiced the Ice King in the Adventure Time (pilot) but was replaced by Tom Kenny for the series.  He also provided additional voice over work for "Sonic the Hedgehog", "Eek!  The Cat", "The Brothers Flub", "Dead Rising", "Casper's Scare School", "Spider-Man 3", "", "Diablo III", "Monsters University", "The Prophet", "" and "The Secret Life of Pets".

Jennifer Betit Yen: Jennifer Betit Yen (born in New York City, New York and a citizen of the US and Ireland) is an actor, lawyer, producer, and writer.  She has been the President of the Asian American Film Lab ("Film Lab"), a non-profit dedicated to the promotion of diversity in media, since 2012, and launched the Film Lab’s first production arm, AAFL TV.  Her first screenplay, The Opposite of a Fairy Tale, about elder abuse, written with help from Aaron Woolfolk, received grant funding from the Ms. Foundation for Women.  Her web series, La La Land, won an Accolade Award for Best TV Pilot in 2009.  As an actor, Betit Yen has performed for East West Players, The Manhattan Theatre Source, which garnered her a "The New York Times" mention, and has been cast in Royal Pains (USA), the FX show, "Dirt and FOX’s "America’s Most Wanted" among others.  She has also done a significant amount of voiceover work, including for Reading Rainbow with LeVar Burton and voicing the "sporty, bouncy and outspoken" character of "Avery" on the series "The Beacon Street Girls".  Betit Yen writes the blog "Ethical is Beautiful.  Be Beautiful" and founded MyJennyBook, a company creating personalized multimedia stories for children.

The Brothers Flub: The Brothers Flub is an animated television series produced by Sunbow Productions and co-produced by Ravensburger.  It aired in the United States of America on the television network Nickelodeon.  The show's title characters are a pair of alien brothers named Guapo and Fraz, both of whom work as couriers, who travel throughout their universe to deliver packages to a different planet in each episode of the series.  "The Brothers Flub" lasted for twenty-six episodes, airing on Sundays from January 1999 until its cancellation in January 2000.

Long John Baldry: John William "Long John" Baldry (12 January 1941 – 21 July 2005) was an English blues singer and a voice actor.  He sang with many British musicians, with Rod Stewart and Elton John appearing in bands led by Baldry in the 1960s.  He enjoyed pop success in the UK where "Let the Heartaches Begin" reached No. 1 in 1967 and in Australia where his duet with Kathi McDonald "You've Lost That Lovin' Feelin'" reached number two in 1980.  Baldry lived in Canada from the late 1970s until his death; there he continued to make records and do voiceover work.  Two of his best known roles in voice acting were as Dr. Robotnik in "Adventures of Sonic the Hedgehog", and as KOMPLEX in "Bucky O'Hare and the Toad Wars.

Letters from Baghdad: Letters from Baghdad is a 2016 documentary film about the life and work of Gertrude Bell.  It was executive produced by Tilda Swinton, who also provides voiceover work as Bell.

Secrets of the Cryptkeeper's Haunted House: Secrets of the Cryptkeeper’s Haunted House was a children's Saturday-morning game show that ran on CBS.  It premiered on September 14, 1996 and lasted until August 23, 1997.  It featured the Cryptkeeper of "Tales from the Crypt" (with John Kassir as the voice) now serving as an announcer.  It is the last TV series in the "Tales From the Crypt" franchise.

Tommy Pope: Thomas Joseph Papa (born November 21, 1979), best known by his stage name, Tommy Pope, is an American stand-up comedian, writer, and actor.  He is known for his work in "Funny or Die" and "National Lampoon".  Pope is also known for co-creating the comedy group, "Deer Prom," which was previously known as "BirdText".  He also provided some voiceover work for the 2013 Disney film, "Planes".  Pope is also starring in the Comedy Central web series, "Delco Proper."

Supporting paragraphs: John Kassir The Brothers Flub
Answer: Sunbow Productions