Curtis was serving under Ronnie Lobell, who had replaced Jack Bauer as Director of Field Operations.

When Lobell was killed in the line of duty, Jack is given the position again, and worked alongside Curtis for much of the day.

This coincides with the arrival of a Division bureaucrat Lynn McGill, who is placed in charge of CTU to coordinate their efforts to find 20 canisters of Sentox nerve gas stolen by Vladimir Bierko.

Curtis aids Jack when CTU attempts to bring in terrorist conspirator Jacob Rossler.

During this time, Homeland Security have taken over CTU and removed all major staff, excluding Chloe O'Brian.

His last action in Day 5 comes in a sting operation to discover Bierko's last target, in which Curtis is non-critically injured.

At the start of Day 6, Curtis and Bill Buchanan meet Jack Bauer at an airfield as he is released from Chinese custody.