"Duel at Sundown" is a 1959 episode of the Western comedy television series Maverick starring 31-year-old James Garner and 29-year-old Clint Eastwood.
An epic fistfight between Garner and Eastwood segues into a surprising showdown between Bret and gunslinger John Wesley Hardin in which Maverick fans his pistol.
"Hardin" turns out to be Bret's brother Bart (Jack Kelly), who'd been recruited to help frighten Eastwood's character who literally flees the town.
As Bret and Bart depart the town on horseback at the episode's conclusion, they run into the real John Wesley Hardin, already angrily riding in to hunt down and murder the man who "killed" him.
James Garner ... Bret Maverick Jack Kelly ... Bart Maverick Edgar Buchanan ... Jed Abby Dalton ... Carrie Clint Eastwood ... Red Hardigan Dan Sheridan ... Doc Baxter James Griffith ... John Wesley Hardin Clarke Alexander ... Sheriff Linda Lawson ... Lily Myrna Fahey ... Susie Ed Reimers ... Announcer (voice)