The Three Musketeers take to the high seas in a "Pirate Adventure" to capture the Black Corsair (Paul Frees). Porthos (Barney Phillips) goes undercover after the Musketeers get a tip from Tooly (Ted Eccles).
Edit: 5/10/17: The original video has been deleted. In its place is a complete episode of the syndicated Banana Splits & Friends, which includes "Pirate Adventure":
If there was one thing I didn't like, it was Aramis (Don Messick) stopping a sword fight to perform a magic trick. Alexandre Dumas never intended for such frivolous distractions.