Felix's origins remain disputed. Australian cartoonist/film entrepreneur Pat Sullivan, owner of the Felix character, claimed during his lifetime to be its creator as well. American animator Otto Messmer, Sullivan's lead animator, has more commonly been assigned credit in recent decades. Some historians argue that Messmer ghosted for Sullivan. What is certain is that Felix emerged from Sullivan's studio, and Cartoons featuring the character enjoyed success and popularity in the 1920s.
from wikipedia.com
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