Paramount cartoons produced by Fleischer Studios continued to be successful, with characters such as Betty Boop and Popeye the Sailor becoming widely successful. One Fleischer series, Screen Songs, featured live-action music stars under contract to Paramount hosting sing-alongs of popular songs. However, a huge blow to Fleischer Studios occurred in 1934, after the Production Code was enforced and Betty Boop's popularity declined as she was forced to have a more tame personality and wear a longer skirt. The animation studio would rebound with Popeye, and in 1935, polls showed that Popeye was even more popular than Mickey Mouse. After an unsuccessful expansion into feature films, as well as the fact that Max and Dave Fleischer were no longer speaking to one another, Fleischer Studios was acquired by Paramount, which renamed the operation Famous Studios and continued cartoon production until 1967.