LOS ANGELES (thefutoncritic.com) -- With President Bush set to address the nation tomorrow night at 9:00 p.m. eastern time, FOX has confirmed various schedule changes to its previously announced plans.

"Reunion," which was set to air its second episode tomorrow night, will be pre-empted completely with said installment now running on September 22 at 9:00/8:00c. (An encore of the show's first episode however will air on Friday at 9:00/8:00c.) In its place will be the aforementioned Presidential address in most time zones followed by a repeat of "The War at Home's" premiere.

Here's a breakdown of all the changes:

THURSDAY, SEPTEMBER 15

Eastern/Central Time:

8:00/7:00 p.m. - "The O.C.: The Shape of Things to Come"
9:00/8:00 p.m. - "Presidential Address"
9:30/8:30 p.m. - "The War at Home: Pilot" (Repeat)*

Pacific Time:

6:00 p.m. - "Presidential Address"
8:00 p.m. - "The O.C.: The Shape of Things to Come"
9:00 p.m. - "The War at Home: Pilot" (Repeat)
9:30 p.m. - "The Bernie Mac Show: Who Gives This Bride" (Repeat)

Mountain Time:

7:00 p.m. - "Presidential Address"
7:30 p.m. - "The O.C.: The Shape of Things to Come"**
8:30 p.m. - "The War at Home: Pilot" (Repeat)**

FRIDAY, SEPTEMBER 16

8:00/7:00c - "Bones: Pilot" (Repeat)
9:00/8:00c - "Reunion: 1986" (Repeat)

THURSDAY, SEPTEMBER 22

8:00/7:00c - "The O.C.: The End of Innocence"
9:00/8:00c - "Reunion: 1987"

* If the speech continues past 9:42 PM ET, "The War at Home" will not air and FOX News will fill to 10:00 PM ET.

** If FOX News fills to 8:00 PM MT, "The O.C." will start at 8:00 PM MT and no other show will air; the News cutoff will be 7:42 PM in MT � thus, primetime in MT could run until 9:12 PM.