NEW YORK -- Coming off a television season that saw its ratings fall by 20 percent, Fox has unveiled a new schedule heavy on big names both in front of and behind the camera in hopes of rejuvenating its prime-time lineup.

"We're making the biggest investment in original programming in our history to ensure that Fox continues to engage viewers and move the culture more than any other entertainment brand," said Fox Entertainment Chairman Kevin Reilly of the new schedule.

The network is taking a more traditional approach to television with nine new sitcoms and dramas for the 2013-14 fall and mid-season schedules.

As part of its efforts to boost ratings, Fox will launch new shows throughout the year.

"This season we're going to take one step forward and really try to break out of the confines of the broadcast season," Reilly said.

Among the stars Fox signed up for new shows are ex-"Saturday Night Live" cast member Andy Samberg and Academy Award nominees Greg Kinnear and Matt Dillon.

Fox is also bringing one of its most popular shows ever out of retirement with "24," the thriller that starred Kiefer Sutherland as anti-terrorist agent Jack Bauer, set to return in late spring and run into the summer.

Returning shows include "Glee," "The Following," "Bones," "The Mindy Project" and "New Girl."

There is talk of a complete overhaul at "American Idol.


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" Randy Jackson, the last original judge, has already said this will be his last season, and speculation continues to swirl that judges Keith Urban, Mariah Carey and Nicki Minaj are also expected to be gone when the show returns next January.

"The format, more than anything will have a few fresh twists, a nice little jolt for next season," Reilly said, adding that there would likely only be three judges next season instead of four.

In the fall, Fox will premiere new dramas "Almost Human" and "Sleepy Hollow" on Monday, both of which are set in the future. "Almost Human," from Abrams, is a crime drama about robots working in law enforcement. "Sleepy Hollow" is a modern take on Ichabod Crane.

On the comedy front, Fox is adding two new sitcoms -- "Dads" and "Brooklyn Nine-Nine" -- to its Tuesday night lineup and bringing back "New Girl" and "The Mindy Project."

Fox's prime-time fall schedule:

Monday

8 p.m. -- "Bones"

9 p.m. -- "Sleepy Hollow"

Tuesday

8 p.m. -- "Dads"

8:30 p.m. -- "Brooklyn Nine-Nine"

9 p.m. -- "New Girl"

9:30 p.m. -- "The Mindy Project"

Wednesday

8 p.m. -- "The X Factor"

Thursday

8 p.m. -- "The X Factor Results"

9 p.m. -- "Glee"

Friday

8 p.m. -- "Junior Masterchef"

9 p.m. -- "Sleepy Hollow" reruns

Saturday

7 p.m. -- "Fox Sports Saturday"

Sunday

7 p.m. -- NFL Football

7:30 p.m. -- "The OT"

8 p.m. -- "The Simpsons"

8:30 p.m. -- "Bob's Burgers"

9 p.m. -- "Family Guy"

9:30 p.m. -- "American Dad"