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"The first season of the show premiered on Fox on Tuesday, October 3, 2000. The show aired on Tuesday nights after That '70s Show and Titus during the 2000 - 2001 television season and did well with both critics and audiences, averaging 10.1 million viewers during its first season on the air.

The following season, however, Fox made the bold decision to move Dark Angel to Friday nights preceding the network's new series Pasadena in order to try and reverse their string of bad luck with the Friday night death slot curse and to give the network's new series 24 a better time period during the week. Their efforts to improve Friday nights were unsuccessful though as Pasadena failed to find an audience and was canceled before the end of its first season on the night, while Dark Angel saw its second season audience drop by nearly 4 million viewers between the first and second seasons, resulting in its inevitable cancellation as well, despite a strong and vocal fan base and a finale directed by series creator James Cameron.

Though fans of the show attribute Dark Angel's decline in ratings to Fox's decision to move the series to a lower-rated night of the week, many also cite changes in the show's format and tone during its second season as reasons for the large decrease in viewership. These changes were said to be a result of budgetary concerns—any high-concept television series that heavily utilizes special effects is expensive to produce—and the departure of several actors, as John Savage, Alimi Ballard and Jennifer Blanc had all left the series as regulars and popular recurring actors William Gregory Lee and Nana Visitor had been written out of the show prior to its cancellation. The final episode of the series aired on May 3, 2002.

After the end of the show's second season, a third season appeared to be close to getting the green light, but Fox instead canceled the show at the last minute in order to make room for Buffy the Vampire Slayer creator Joss Whedon's new science fiction series Firefly on the network's schedule. Incidentally, Firefly suffered the same fate as Dark Angel and was subsequently canceled the following season as well.

Though canceled due to sagging ratings in its second season, Dark Angel has high availability with most on-demand services as the Sci-Fi Channel in the United States and E4 in the United Kingdom regularly air reruns of both seasons. As of 2003, both seasons of the show are also available on DVD."
(http://en.wikipedia.org/wiki/Dark_Angel_%28TV_series%29)