Sean and his field partner Aaron were present when Ronnie met Jack Bauer for the first time, and then accompanied Ronnie to follow a lead on the Turkish terrorist Tomas Sherek. Sherek was suspected to be hiding in a Turkish-owned laundry store, operated by Maurice Landstrass. Ronnie sent Aaron and Sean to cover the exits of the store, and the three apprehended Sherek when he revealed himself and tried to flee. Ronnie, Aaron, and Sean returned to CTU and handed over Sherek for interrogation.
Later in the day, Sean was part of a field team along with Curtis Manning alongside Aaron and other field agents to apprehend Yosik Khatami at a harbor in Los Angeles.