Stardate 45092.4: While assisting in repairs on a Romulan ship, Ro Laren and Geordi La Forge apparently die in a transporter accident. The two rematerialize on board the Enterprise but they are not visible to the rest of the crew and they can pass through walls. While Laren thinks she is dead, Geordi seeks for a scientific explanation. They soon find that their current state is the result of a Romulan experiment - they are phase-cloaked. When they discover that a cloaked Romulan has sabotaged the Enterprise's warp core, they try to warn their crew by producing chroniton traces, but Data who discovers the traces regards them as random patterns, and his cleaning isn't sufficient to make them visible again. Looking for a suited place to get the attention of as many people as possible, they flood their own memorial service with chronitons, and the cleaning procedure makes them visible again, just in time to warn Picard not to activate the warp drive.

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