X Marks the Spot is the sixth episode of Josie and the Pussy Cats. It first aired 17 October 1970.


In London, the friendly Professor Isaac Belfour sneaks onboard the Pussy Cats' bus and tells them of his rogue assistant, Mr. X, who used the professor's new formula to make himself invisible and seeks the paper that has the exact details of the antidote he's created. They agree to help the professor hide it, taking him along for their gig in Puddletown, England, to protect him from Mr. X, but not before he uses his newfound ability to capture three of the gang, and the others have to rescue them.


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