The Metro-Goldwyn-Mayer cartoon studio was the in-house division of Metro-Goldwyn-Mayer (MGM) motion picture studio in Hollywood, responsible for producing animated short subjects to accompany MGM feature films in Loew's Theaters. Active from 1937 until 1957, the cartoon studio produced some of the most popular cartoon series and characters in the world, including the famous cartoons Barney Bear and Droopy, but particularly its most important creation, Tom and Jerry.