|First Appearance||Journey to Xilbalba|
|Last Appearance||Journey to Xilbalba|
Doctor Sumner is one of the few medical doctor's in Charleston, South Carolina. He provided medical support after the mole bombed Charleston injuring many.
Sumner was trapped underground with many others, when the mole planted a device that caused the underground part of Charleston to be collapse on top of them. When Tom and Marina found Sumner, he checked out Marina. He was tending to the wounded, and when Tom brought Lourdes in and he immediately went to help her. Tom checked in on Marina Peralta and Lourdes, Sumner told him they both had concussions. Some time later he caught Lourdes out of bed and told her she needed to get back in bed. She felt she needed to help the wounded, he told her she was one of the wounded and they had everything covered.
When the 2nd Mass was returning to Charleston after 22 days, the Espheni attacked, deploying Mega-Mechs, Beamers, and Obelisks. With the 2nd Mass separated, most of the remaining survivors from the attack are being held in the Ghetto Camps in Charleston, run by the Espheni; leaving his fate unknown.
|Season 3 appearances|
|On Thin Ice||Collateral Damage||Badlands||At All Costs||Search and Recover|
|Be Silent and Come Out||The Pickett Line||Strange Brew||Journey to Xilbalba||Brazil|