Unnamed Dream Aliens
List of unnamed members of the "Dream Aliens".

Leader 

This male was the leader of a group of individuals who took over the  in 2374.

He appeared in nightmares of Kathryn Janeway, Tuvok, Tom Paris, and Harry Kim with the result that Kim did not woke up from his nightmare. More and more crewmembers of the Voyager fell asleep until only The Doctor and Chakotay were awake. After Chakotay found the hiding place of the aliens and the transmitter they were using and confronted the leading alien during another communal dream, he withdrew and released the crew of the Voyager. ()

Sleeping aliens 
Four aliens accompanied their leader aboard the Voyager during their initiated nightmares of the Voyager crew. In this nightmares they were armed with rifles and brought all personnel aboard the Voyager into the cargo bay. One of the aliens was awakened by Commander Chakotay when he found the hiding place of the aliens on a planet. In this hiding place, dozens of these aliens were asleep. ()

Dream species