First he returned to television to save the world from an international terrorist threat on 24: Live Another Day, and now Jack Bauer has taken on an even greater — and far chillier — challenge.

That’s right, Kiefer Sutherland has undertaken the ALS Ice Bucket Challenge, and decided to go all in and sans shirt.

After taking the icy plunge, Kiefer nominates some friends in New Jersey.

#ALSIceBucketChallenge on Twitpic