In the year 2019, the U.S.A. becomes a third world country after the pulse hit - an electromagnetic shock triggered by terrorists in 2009. It's the world of Max, a broken world hard to live by, even for a genetically engineered super soldier. Escaping her creators (Manticore), she is trying to find her long lost siblings. She joins Eyes Only, a cyber journalist who tries to make the world a better place.
 

Jensen played the role of 2 transgenics in Dark Angel. As a guest star during the first season, he played Ben (X5-493) in the episode #117 - Pollo Loco. Ben was one of the 12 X5s that escaped shortly before the pulse hit in 2009. He became a serial killer and believed in the Blue Lady. Max had to kill him at the end of the episode.
 

The producers then decided to hire him to play another transgenic for the second season of Dark Angel. For 18 of the 21 episodes, he played Alec (X5-494), a clone or a twin of Ben. Alec was raised in Manticore. Max didn't know of his existence until she was recaptured by Manticore. Thinking at first he was her brother Ben, whom she had killed, she was shocked to find out he was in fact X5-494 and that he was assigned as her breeding partner. Since Max, helped by Zack, Krit and Syl destroyed the Manticore genetic lab, Manticore found an alternative way to "create" the next generation of transgenics: the old fashioned way, hence the breeding partner program. Max refused to obey Manticore's orders to procreate with X5-494 and let him know by kicking him in the gut. She instantly developed a strong dislike for him and named him Alec, cause he was Smart Alec. That scene marked the beginning of numerous quarrels between Max and Alec throughout the season. Max burned Manticore to the ground at the beginning of the second season and tried to free the transgenics locked up in Manticore. The second season dealt, in large part, with transgenics and transhumans out in the world.

So Alec tries to learn to live as a free man. At first, he acts like a selfish, egotistic playboy who's only after himself. We gradually learn that there is more to him than meets the eye.

= Screen captures
= Episode Review

Season 1 - Appeared as a guest star (Ben / X5-493)

Season 2 - Cast as a regular (Alec / X5-494)