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There is a shared lament among fans that Caval was not brought back for further installments in the franchise. As one user notes, "It's one of the biggest mistakes of any franchise that they didn't bring him back." Suggestions abounded that Caval's character could have been made even more compelling with upgrades like a metal forehead or a half-cyborg look—visions that would elevate his villainy beyond what we saw in the previous films.
From Superman to Spymaster: Caval’s Range And Breakout Roles
Before his stint in espionage-driven blockbusters, Caval's work in "Man from U.N.C.L.E." was singled out as a near-perfect approximation of James Bond. His charisma and sophistication in that role showcased his ability to handle suave, secret-spy archetypes effortlessly.