I started at the beginning. Episode 2 - Night Patrol - hooked me. I think episode 20 - Monkeyshines - is my favorite and could serve as a good intro to the series.
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Recommendations: Red Panda, Black Jack Justice, Saturday Morning Theatre, Dr. Floyd, Shade's Brigade, Doc Savage, Avengers, Jake Sampson, Lone Ranger, Night Beat, Six Shooter, Dragnet, Johnny Dollar, Box 13, Star Wars, Lord of the Rings, Pawn Quests, Adventures in Odyssey, Space Marshal Dylan McCade, Thrilling Adventure Hour, Action Science Theatre, Earbud Theater