While on Gamma Site the base came under siege by R75 insects which managed to get free of their confines and seek out their new food source -- meat. Chapman and the rest of the delegation were evacuated from the base by SG-1. For approximately a day they survived on the planet away from the base, traveling on foot and spending the night in a cave.
Chapman remained relatively calm about the group's situation, even after the two airman who were guarding the group were eaten by the voracious creatures. He and the rest of the group survived to reach the remote research station, where Colonel Samantha Carter redirected the transmitter equipment into space, to be detected by the Odyssey.
Following the incident on Gamma Site, Chapman returned to work at the I.O.A.
The Scourge - Mr. Chapman represents his country in a mission to visit Stargate Command's Gamma Site, getting more of an adventure than he bargained for.