|First Appearance||Prisoner of War|
|Last Appearance||Eight Hours|
|Allegiance||2nd Massachusetts Militia Regiment|
Sentry is a fighter in the 2nd Massachusetts Militia Regiment.
When Porter arrives to there new camp at the school, Sentry is one of the trusted soldiers that listen to it, and later is sent in groups of 3-4 to find supplies. Sentry witnesses Tom Mason arrive back with a prisoner of war skitter in shock. When Tom asks to trade in his weapon for an automatic Weaver takes Sentry's gun and gives it to Tom
Sentry listens to Tom Mason when he says he is staying behind at the school to let the civilians get further, and Sentry volunteers to stay behind also. Sentry is seen next to Tom Mason behind the barricade, and shoots at the first Mech when it arrives at the school with the Mech bullets. Another wave of Mechs arrive and the fighters run out of ammo, however Uncle Scott's trasmitter jams the aliens and they flee. Sentry cheers with John, and he later is seen inside the school, getting ready to leave.
|Season 1 appearances|
|Live and Learn||The Armory||Prisoner of War||Grace||Silent Kill|
|Sanctuary (Part 1)||Sanctuary (Part 2)||What Hides Beneath||Mutiny||Eight Hours|