Sergeant Sergei Antonov (Russian: Сергей Антонов) is a Soviet Commissar in the game Call of Duty: United Offensive. He first appears in the first Russian campaign level after the player comes out of the ammunition bunker. He is the player's squad leader in each Russian mission with the exception of tank levels. In the first level, he will act like a Commissar and shoot the player if they fall back in the trenches, as will the other Commissar in the same trench. In the second level, he orders the player to spot targets for Korolov so they could take out machine gun nests and Elefant tanks. He is reassigned with the rest of his squad to the 15th Guards Rifle Division after Yuri Petrenko returns to the infantry after the tank level. He is last seen when Yuri takes out the last tank in the last level as the troop train arrives and swarms of infantry and tanks drive over the former German position pushing them straight out of Kharkov. It is unknown if he survived the rest of the war.