His first appearance was in the 1938 Lew Landers film Blind Alibi.

He is considered by many critics an attempt by RKO Pictures to cash in on the success of Warner Bros.' canine sensation, Rin Tin Tin, also a German Shepherd.

[1] After making several program pictures for RKO, Ace moved to Republic Pictures for several more projects, before moving to Columbia Pictures for a role as the Phantom's sidekick "Devil" in the serial The Phantom in 1943.

[2] His declining popularity meant that most of his appearances after RKO's initial burst of "Ace" publicity were for Monogram and the Poverty Row studio Producers Releasing Corporation.

He did not reprise the role in any of the subsequent installments.