Lieutenant Castille was a powerful telepathic Mentitie assigned to the USS Enterprise-A. He volunteered for the shuttle mission aboard the Copernicus shuttle to Omicron Ceti IV. (TOS comic: "Marriage of Inconvenience")

While suffering from a rare Mentite disease called Le Guin's Syndrome, Castille imposed a shared telepathic illusion upon the crew of the Enterprise that trapped them in a replica of Dante's Inferno. (TOS comics: "Haunted Honeymoon", "Hell in a Handbasket")