Robert Walker Jr, who featured in that second Star Trek TOS episode, survived D.C. Fontana only a few days... as his namesake father had passed suddenly in the 50s, he'd dropped the "Jr" in his career, full of guest-star TV roles lasting well into the 80s on top of film work alongside John Wayne (The War Wagon), Peter Fonda (Easy Rider), and the title role in the Mister Roberts-inspired Ensign Pulver...
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