Question: The NeverEnding Story film starred an actor who had an active career doing what in cartoons?
Context: Alan Louis Oppenheimer (born April 23, 1930) is an American actor and voice actor.  He has performed numerous roles on live-action television since the 1960s, and has had an active career doing voice work in cartoons since the 1970s. The NeverEnding Story (German: "Die unendliche Geschichte") is a 1984 West German English language epic fantasy film based on the novel of the same name by Michael Ende, about a boy who reads a magical book that tells a story of a young warrior whose task is to stop a dark storm called the Nothing from engulfing a mystical world.  The film was produced by Bernd Eichinger and Dieter Giessler and directed and co-written by Wolfgang Petersen (his first English-language film) and starred Noah Hathaway, Barret Oliver, Tami Stronach, Patricia Hayes, Sydney Bromley, Gerald McRaney, Moses Gunn, and Alan Oppenheimer as the voices of both Falkor and Gmork (as well as other characters).  At the time of its release, it was the most expensive film produced outside the United States or the Soviet Union.  The film was the first in "The NeverEnding Story" film series and later followed by two sequels. Mark Rendall (born October 21, 1988) is a Canadian actor, perhaps best known for starring in the title role of the 2004 film, "Childstar", as well as Mick in Season 1 of the Canadian television drama series "ReGenesis".  He played Bastian Bux in the TV series, "Tales from the Neverending Story", and the title character in "The Interrogation of Michael Crowe".  He has also done voice work for the television series "Jane and the Dragon" and "Time Warp Trio", and starred in the popular kid TV series "Arthur" (Season 6-8).  Recently, Rendall has appeared in several Hollywood films. Spot Marks the X is a 1986 Disney Channel Original Movie that starred Mike the Dog (from "Down and Out in Beverly Hills") as Capone/Astro, Barret Oliver (from "The Neverending Story", "Frankenweenie", "D.A.R.Y.L", and "Cocoon") as Ken, and Natalie Gregory (from "Alice in Wonderland (1985 version)", "Oliver & Company", and "Cranium Command") as Kathy, who, unlike her role as Alice in the aforementioned 1985 version, is seen with her real hair in this movie, which is brunette.  It was produced by Gregory Harrison's production company, The Catalina Production Group, Ltd. in association with Walt Disney Television. Melody Kay (born 1981) is an American actress.  She starred in several movies including "Camp Nowhere" and "The NeverEnding Story III: Escape from Fantasia". The NeverEnding Story II: The Next Chapter is a 1990 German-American fantasy film and sequel to "The NeverEnding Story".  It was directed by George T. Miller and stars Jonathan Brandis as Bastian Bux, Kenny Morrison as Atreyu, and Alexandra Johnes as the Childlike Empress.  The only actor to return from the first film was Thomas Hill as Mr. Koreander.  The film used plot elements from Michael Ende's novel "The Neverending Story" (primarily the second half) but introduced a new storyline.  Upon its American theatrical release in 1991, the Bugs Bunny animated short "Box-Office Bunny" was shown before the film.  This short was also included on the VHS and Laserdisc release later that year. "The NeverEnding Story" is the title song from the English version of the 1984 film "The NeverEnding Story".  It was performed by Limahl.  Limahl released two versions of the song, one in English and one in French.  The English version featured vocals by Beth Anderson, and the French version featured vocals by Ann Calvert.  It was a success in many countries, reaching No. 1 in Norway and Sweden, No. 2 in Austria, Germany and Italy, No. 4 in the UK, No. 6 in Australia and No. 6 in the US Billboard Adult Contemporary chart. Christopher Hamill (born 19 December 1958), better known by his stage name Limahl (an anagram of Hamill), is an English pop singer.  He rose to fame as the lead singer of the 1980s pop group Kajagoogoo, before embarking on a briefly successful solo career, which reached its peak with the 1984 hit "The NeverEnding Story", the theme song for the film of the same name. Noah Leslie Hathaway (born November 13, 1971) is an American actor and a former teen idol.  He is best known for his roles as Atreyu in the 1984 film "The NeverEnding Story" and for portraying Boxey on the original TV Series "Battlestar Galactica".  His work in "The Neverending Story" made him particularly popular as a teen-aged celebrity in Europe. The NeverEnding Story III: Escape from Fantasia (also known as: The NeverEnding Story III: Return to Fantasia) is a 1994 film and the second sequel to the fantasy film "The NeverEnding Story" (following the first sequel "").  It starred Jason James Richter as the principal character Bastian Bux, and Jack Black in one of his early roles as the school bully Slip.  This film used the characters from Michael Ende's novel "The Neverending Story" (1979), but introduced a new storyline.
Answer: voice work