Sean Astin has joined the cast of '24', a weekly Fox drama about a Counter Terrorism Unit (CTU) starring Kiefer Sutherland. This already-awesome show will now featre Astin as (possibly) the new head of CTU. From AICN: The fifth season of “24” will kick off much the same as the fourth. We’ll get two hours on Jan. 8 and another two on Jan. 9.