LOS ANGELES (thefutoncritic.com) -- Sci Fi has firmed up its fall rollout plans, network sources have confirmed to the site today.

Here's a breakdown of what to expect:

-- "Ghost Hunters" and "Destination Truth" return with new episodes on Wednesday, September 3. They'll take over for "Ghost Hunters International" and "Scare Tactics" which wrap their summer runs on August 20 and August 13, respectively.

-- "Lost" then will kick off its off-network run on Monday, September 15. A block of four episodes will air starting at 7:00/6:00c every Monday.

-- "Eureka" will broadcast its mid-season finale on Tuesday, September 23 at 9:00/8:00c. The following week on September 30, "ECW" will slide into the 9:00/8:00c slot followed by the fall premiere of "Scare Tactics" at 10:00/9:00c. As for "Eureka," the remainder of its third season (13 episodes) will presumably roll out sometime in 2009.

-- "Stargate Atlantis" will wrap the front half of its fifth season on Friday, September 26 at 10:00/9:00c. Newcomer "Sanctuary" launches the following Friday on October 3 with a special two-hour premiere. Said drama is being billed as "the first television series to feature live-action actors against primarily virtual sets."