In the fourth season, there seem to be many events related to drama and science fiction where the Klingon holiday, known as the 'Day of Honor', comes again, and this year Polana Torres decides to embrace her heritage in the Klingon and participate in a series of liturgical endurance tests. But the blood pie and painstiks are the last thing in her mind when an emergency call expels basic deformities. Torres and Tom Paris are sent in a shuttle to retrieve them but the Katyats decide they want the nucleus and destroy the shuttle.
Voyager at times gets grief for not being as gritty as the premise promised, but even the most cynical of fans can't deny that "Year of Hell" delivered the goods, with the crew battling a genocidal villain (Kurtwood Smith) manipulating time itself.
Despite being a transparent attempt to 'sex up' the show, it was a tremendous introduction for the character and, more importantly, gave Voyager a much-needed kick up the arse in terms of both drama and conflict.