4-08: Year of Hell, Part I
Voyager is repeatedly attacked by Krenim warships while a scientist alters history by eliminating entire races from existence.
4-07: Scientific Method
Seven discovers that Voyager's crew are subjects of secret deadly experiments.
4-18: The Killing Game, Part I
Their memories erased, Voyager’s crew are placed into a World War II holoprogram to be studied and hunted by the Hirogen.