CBS today announced dates for the fall premieres of its new and returning series, which include a pre-season debut for Survivor: Samoa and the launch of the new Sunday drama series Three Rivers in early October. The Network will introduce the majority of its schedule beginning Monday, Sept. 21, the official start of the 2009-2010 season.

Survivor: Samoa, the 19th installment of the hit reality series, will debut a week prior to the formal start of the season, on Thursday, Sept. 17 (8:00-9:00 PM, ET/PT).

CBS's new season rollout officially begins on Monday, Sept. 21 with How I Met Your Mother (8:00-8:30 PM, ET/PT), the premiere of the new comedy Accidentally on Purpose (8:30-9:00 PM, ET/PT), the seventh season premiere of television's Number One comedy Two and a Half Men (9:00-9:30 PM, ET/PT), the third season premiere of The Big Bang Theory in its new time period (9:30-10:00 PM, ET/PT) and the eighth season premiere of CSI: Miami (10:00-11:00 PM, ET/PT).

NCIS begins its seventh season on Tuesday, Sept. 22 (8:00-9:00 PM, ET/PT), followed by the new NCIS: Los Angeles spin-off (9:00-10:00 PM, ET/PT) and the freshman drama The Good Wife (10:00-11:00 PM, ET/PT).

CBS returns its Wednesday comedy block on Sept. 23 with the fifth season of The New Adventures of Old Christine (8:00-8:30 PM, ET/PT) and sophomore comedy Gary Unmarried (8:30-9:00 PM, ET/PT), followed by the fifth season premiere of Criminal Minds (9:00-10:00 PM, ET/PT) and the sixth season premiere of CSI: NY (10:00-11:00 PM, ET/PT).

CSI: Crime Scene Investigation returns for its 10th season on Thursday, Sept. 24 (9:00-10:00 PM, ET/PT) followed by the time period premiere of last season's No. 1 new hit The Mentalist (10:00-11:00 PM, ET/PT).

The Network's top-rated Friday lineup returns on Sept. 25 with the fifth season premiere of Ghost Whisperer (8:00-9:00 PM, ET/PT), the Network debut of the popular drama Medium (9:00-10:00 PM, ET/PT), followed by the sixth season premiere of Numb3rs (10:00-11:00 PM, ET/PT).

CBS's Saturday schedule premieres Sept. 26 with the return of 48 Hours Mystery (10:00-11:00 PM, ET/PT), preceded by two hours of Crimetime Saturday (8:00-10:00 PM, ET/PT).

60 Minutes, television's highest rated news magazine, returns for its 42nd season on Sunday, Sept. 26 (7:00-8:00 PM, ET/PT), followed by a special two-hour debut of the 15th edition of the multi-Emmy Award-winning The Amazing Race (8:00-10:00 PM, ET/PT) and the seventh season premiere of Cold Case in its new time period (10:00-11:00 PM, ET/PT).

Premiering a week later on Sunday, Oct. 4 is the new drama Three Rivers (9:00-10:00 PM, ET/PT).

CBS's 2009-2010 Premiere Dates

Thursday, Sept. 17

8:00-9:00 PM Survivor: Samoa (19th Installment Premiere)

Monday, Sept. 21

8:00-8:30 PM How I Met Your Mother (5th Season Premiere, OAD 9/19/05)

8:30-9:00 PM Accidentally on Purpose (Series Debut)

9:00-9:30 PM Two and a Half Men (7th Season Premiere, OAD 9/22/03)

9:30-10:00 PM The Big Bang Theory (3rd Season Premiere, OAD 9/24/07)

10:00-11:00 PM CSI: Miami (8th Season Premiere, OAD 9/23/02)

Tuesday, Sept. 22

8:00-9:00 PM NCIS (7th Season Premiere, OAD 9/12/03)

9:00-10:00 PM NCIS: Los Angeles (Series Debut)

10:00-11:00 PM The Good Wife (Series Debut)

Wednesday, Sept. 23

8:00-8:30 PM The New Adventures of Old Christine (5th Season Premiere, OAD 3/13/06)

8:30-9:00 PM Gary Unmarried (2nd Season Premiere, OAD 9/14/08)

9:00-10:00 PM Criminal Minds (5th Season Premiere, OAD 9/22/05)

10:00-11:00 PM CSI: NY (6th Season Premiere, OAD 9/22/04)

Thursday, Sept. 24

9:00-10:00 PM CSI: Crime Scene Investigation (10th Season Premiere, OAD 10/6/00)

10:00-11:00 PM The Mentalist (2nd Season Premiere, OAD 9/23/08)

Friday, Sept. 25

8:00-9:00 PM Ghost Whisperer (5th Season Premiere, OAD 9/23/05)

9:00-10:00 PM Medium (Network Debut, OAD 1/23/05)

10:00-11:00 PM Numb3rs (6th Season Premiere, OAD 1/21/05)

Saturday, Sept. 26

8:00-9:00 PM Crimetime Saturday

9:00-10:00 PM Crimetime Saturday

10:00-11:00 PM 48 Hours Mystery (Season Premiere)

Sunday, Sept. 27

7:00-8:00 PM 60 Minutes (42nd Season Premiere)

8:00-10:00 PM The Amazing Race (15th Edition Premiere)

10:00-11:00 PM Cold Case (7th Season Premiere, OAD 9/23/03)

Sunday, Oct. 4

9:00-10:00 PM Three Rivers (Series Debut)