02E10 - Vanishing Point

Hoshi and Trip are investigating some abandoned ruins when suddenly two storms charged with polaric energy are moving in their direction. There's no time to move back to Enterprise with the shuttle and they are forced to use the transporter. After apparently everything went well with the device, Hoshi starts feeling weird. She thinks a birthmark has moved a centimeter and when water seems to be dropping through her hands, her mirror image disappears and hardly no one seems to notice her, she really gets worried. Phlox thinks it's only psychological. But when all of the sudden everybody on the ship is looking for her and she sees some aliens planting bombs, she knows there's definitely something wrong.