The deal gives both SCI FI and G4 -- a network aimed at the male 18-34 demographic -- rights to existing episodes of "Lost," which the networks will debut in prime time in fall 2008, extending through all six seasons of the series, SCI FI said.

"'Lost' is an incredible series that has captured the imagination of the viewing public, and SCI FI is extremely proud to add 'Lost' to our programming lineup," Thomas Vitale, SCI FI's senior vice president of programming and original movies said in a statement.

"SCI FI's broad base of viewers will be able to experience the 'Lost' phenomenon -- many for the first time ever -- in a pure form, stacked in weekly mini-marathons, which we believe is the best way to get involved with this critically acclaimed program. And on SCI FI's HD feed, many viewers will be able to enjoy the spectacular detail and visual beauty of the series."