In other episodes, Torres Roxann Biggs-Dawson tests the limits of Klingon honor "Barge of the Dead", Tuvok Tim Russ stretches his emotions "Riddles, Paris Robert Duncan McNeill and Kim Garrett Wang embark on a new holdeck program, wrestling superstar the Rock makes a gimmicky guest appearance "Tsunakatse", a former crew member returns "Fury", and the crew discovers a group of abandoned Borg children "Collective". The two most interesting characters continue to be the Doctor Picardo and Seven of Nine Jeri Ryan. The former stretches out numerous times "Tinker, Tailor, Doctor, Spy," "Virtuoso," "Life Line", and we learn more about Seven's Borg past in "Survival Instinct" and the season closer, in which Seven discovers that during regeneration she can enter a dream world called Unimatrix Zero. There she meets a number of mutated Borg who can exist in this world in their pre-assimilation state and who also present an idea for destroying the collective from within. The Borg Queen, however, discovers the plan and ends the season in a nightmarish cliffhanger that recalls the great Next Gen episode "The Best of Both Worlds." --David Horiuchi