|Allegiance||7th Massachusetts Militia Regiment|
|First Appearance||Sanctuary (Part 1)|
|Last Appearance||Sanctuary (Part 2)|
|Cause of Death||Shot in the chest by Tom Mason.|
|Terry after being shot by Tom.|
Lt. Terry Clayton was the Commander of the 7th Mass. He was old friends with Mike and Daniel Weaver. Terry was working with the Espheni to trade in kids, lying to the 2nd Mass to bring their kids to the Sanctuary to be traded in.
The 7th Mass was completely wiped out, and he is one of 20 known survivors. He was working with the Skitters trading kids for safety. Pope came across their base attempting to steal some food from them, Clayton interrogated Pope, who unwillingly gave up information regarding the 2nd Mass. Clayton went to the 2nd Mass and lied to them convincing them to send their children with him. The night they get to the base he convinces one of the children, Eli, to go with him, saying he can see his parents, however Clayton gives him over to a Skitter, revealing he is working for them now.
The 7th Mass's secret was discovered and the 2nd Mass kids escaped from the 7th Mass base he and his men gave chase but were temporarily stalled by Mike despite him saying earlier he liked Mike, he killed him. He and his men tracked the children down they briefly fought Pope brought the children and Tom back to the 7th Mass base where the 2nd Mass came out of their base and a couple men were shot. He was shot to death by Tom Mason after he attempted to pull a pistol on Hal.
|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|