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.
4-01: Scorpion, Part II
Voyager strikes an uneasy partnership with the Borg to fend of Species 8472's invasion.
Voyager is confronted by the Hirogen after usings their ancient network of relay stations to retrieve letters from home.
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.