Three Aces Comics v5 #51

The cover features the Three Aces in action against criminals and a giant mechanical robot, while the caption notes that Dr. Destine and the Purple Rider are also featured in this issue. In the visible story pages, the Purple Rider pursues criminals involved in a diamond heist, leading them to a zoo where he confronts a vicious grizzly bear before subduing them. Elsewhere, Dr. Destine investigates a mysterious case involving forged documents and discovers an imposter has infiltrated a police laboratory, leading to a dangerous confrontation with the culprit.