The crew of the U.S.S. Voyager is attacked by an alien species who occupy a parallel reality in the human dreamstate. Only Chakotay, with his native knowledge of waking dreams, knows how to lead a counter-attack.

Mark Colson (Dream Alien)
Jennifer Grundy (Ensign)

• Tuvok shows up on the bridge nude in his nightmare. In an interview with Ethan Phillips, he says: "When we shot it, he showed up with only a long black sock hanging from his groin and that's all. We all laughed hard over that one."