Ad for Thelma Todd movie proclaims that none other than Popeye hiself will appear in person, in the person of voice actor Billy Costello.
From the Thelma Todd Fan Group on facebook
Costello provided the voice for the spinach-swallowing sailor for the first 25 Popeye cartoons produced the Fleischer Studios. Per Wikipedia: "...he was fired by the Fleischers, allegedly over 'bad behavior,' and was replaced with Jack Mercer. Costello's final appearance was in You Gotta Be a Football Hero (1935).