Sheckley

Sheckley is a no-nonsense Resistance soldier who appears in the This Vortal Coil chapter of Half-Life 2: Episode Two.

Sheckley was assigned to a Resistance post outside of City 17 but was forced underground as attacks from Zombies and Antlions brought the number of troops there down to just him and a medic named Griggs. Sheckley and Griggs have very different personalities; Sheckley is serious and professional whilst Griggs is naïve and light-spirited.

When a Vortigaunt brought the wounded Alyx Vance down into the mines, Sheckley and Griggs protected them from antlion assaults. When Gordon Freeman arrived, Sheckley and Griggs briefed him on the current situation and helped him fend off Antlion assaults until more Vortigaunts arrived to reinforce their position.

After the battle, Sheckley and Griggs stayed behind to protect Alyx Vance and the Vortigaunts while Gordon and the first Vortigaunt ventured into the core of the Antlion nest to retrieve some "Larval Extract". It is unknown what Griggs and Sheckley do after Gordon, Alyx and their Vortigaunt friend leave, it is possible they accompanied the rest of Vortigaunt group in hunting Advisors.

Trivia
 * Adam Baldwin provides the voice for Sheckley.
 * According to the Orange Box Prima Guide, Sheckley and Griggs were inspired by Abbott and Costello. This is confirmed in the developer commentary.