Picard did experiments with theta-band emissions on the Stargazer, Crusher is there to find and destroy any biotoxins, and Worf is there for muscle. They can’t go into Cardassian territory on a Starfleet shuttle, so they acquire passage on a Ferengi cargo carrier. Upon arrival at Celtris III, they move through caves that look like the ones from the holodeck. However, the real thing has bats, which startle Worf (“You’re not afraid of bats, are you, Lieutenant?” “Of course not!”), and then they have to rappel down a cliff face, which makes Crusher apprehensive (“You’re not afraid of heights, are you, Doctor?” “Of course not!”).
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