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This article's subject relates to Season 4 of 24.
You may be looking for a different Carl.

Carl was a contact of Secretary of Defense James Heller and Al during Day 4.

Day 4[]

While Secretary Heller, Audrey Raines, and Jack Bauer departed their hotel at 7:22am, the Secretary spoke to Al on the phone. Al informed the Secretary that thirty-two people had been confirmed dead in a suspected terrorist attack in the Santa Clarita valley, where a train had been bombed only twenty minutes prior. He then advised Heller to call Carl, and Heller agreed.