"24 Minutes" is set to become the landmark 400th episode of The Simpsons on May 20, 2007. Featuring 24's Jack Bauer and Chloe O'Brian (guest-voiced by Kiefer Sutherland and Mary Lynn Rajskub) it will tell the story of Springfield Elementary's CTU (Counter Truancy Unit), presumably in real time.
Before that, however, the March issue of Simpsons Comics will contain a 24 parody of its own:
Simpsons Comics #128
by Boothby & Ortiz
"It's the longest day of Homer Simpson's life! With the Springfield Nuclear Power Plant set to self-destruct and the lives of everyone in town at stake, only one man can set things right and save the world in the next 25 hours. If only he would put his pants back on!"