Star Trek - Enterprise - Season 3 (2003-2004) 5

With awesome episodes like the alternate future Twilight, and the jaw-dropping Azati Prime (complete with a glimpse at the future...and the ENTERPRISE-J!!!), this season is Enterprise's best...bar none. The Xindi arc is gripping sci-fi at its finest, mixing action, continuity, time travel, special effects and more. The mind-warping conclusion of the season finale, Zero Hour, is equally astounding!