Voyager is confronted by the Hirogen after usings their ancient network of relay stations to retrieve letters from home.
4-14: Message in a Bottle
The Doctor is sent to the Alpha Quadrant through an alien relay network, arriving aboard a Starfleet vessel commandeered by Romulans.
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.
4-02: The Gift
As Voyager limps out of Borg space, Kes undergoes a dramatic transformation and a unique new member joins the crew.