NBC has moved its boxing reality series "The Contender" yet again, setting the show and Sundays and moving "American Dreams" out of its three-year home and onto Wednesday nights for the remainder of its season.

The moves are among several changes the network is making to its midseason schedule, including a special preview and new premiere date for the comedy "The Office" and an earlier start for the fourth "Law & Order" series.

"We are tweaking our rollout of three fine and promising series ... in order to provide the best launch platform possible in March," says Kevin Reilly, president of NBC Entertainment. "Plus, 'American Dreams' will have the chance to add new viewers to its loyal audience in its new mid-week position."

"The Contender," a Mark Burnett-produced series in which 16 up-and-coming boxers vie for a $1 million prize, was previously scheduled to premiere Monday, March 7 and then move to its regular spot at 8 p.m. ET Wednesdays. NBC has kept the 90-minute premiere but shifted the show's regular home to 8 p.m. Sunday, beginning March 13. A second preview episode will air following "The Apprentice" on Thursday, March 10.

The show has bounced around several spots on NBC's schedule, having first been set for Tuesdays, then moved to Wednesdays to get out of the way of FOX's "American Idol." Such frequent schedule moves are often a bad sign for a show, but NBC executives insist they're huge fans of "The Contender" and want to give it every chance to succeed.

It will face some formidable competition on Sundays, however, from ABC's "Extreme Makeover: Home Edition" and CBS' "Cold Case," both of which draw more than 15 million viewers per week.

"American Dreams," meanwhile, will air the final episodes of its third season at 8 p.m. Wednesdays beginning March 9. It will mark the first time that the show, which has been benched for February sweeps, has aired outside of its Sunday home.

NBC has also moved up the premiere date of "Law & Order: Trial by Jury" by several weeks. After a preview on Thursday, March 3, it will settle into its 10 p.m. Friday spot the following night. It takes over for "Medical Investigation," which has taken a hit the past couple weeks from the new CBS show "Numb3rs."

Finally, the premiere of "The Office" has moved back one week to 9:30 p.m. Tuesday, March 29. The American adaptation of the BBC hit will get a preview at 9:30 p.m. Thursday, March 24, following an early-starting episode of "The Apprentice."