When the Doctor invites the holographic Reg to play golf, he mentions a few locations to choose from. One of them is situated on Giedi Prime - known to "Dune" fans as the Harkonnen home planet. See more...
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Character mistake: Captain Janeway's main goal in this episode is to proceed to the holodeck and shut down the lightning shield protecting Chaotica's death ray so Lt. Paris can shoot it with his destructo beam. Throughout the scene where Lt. Paris further briefs Capt. Janeway on her way to the holodeck, the plot is such that her goal is to shut down the death ray, not the lightning shield.