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.
Voyager is confronted by the Hirogen after usings their ancient network of relay stations to retrieve letters from home.
4-01: Scorpion, Part II
Voyager strikes an uneasy partnership with the Borg to fend of Species 8472's invasion.
Chakotay becomes involved with a mysterious woman who seeks asylum on-board Voyager.