Listen to the sound clip Who's next? from Serious Sam Sounds: Who's next? Who's next? This sound is from Serious Sam Sounds Serious Sam is a first-person shooter video game franchise developed by Croteam and published by Devolver Digital, known for its fast-paced action and humor. See also: Doom, Quake, Duke Nukem, Half-Life, Team Fortress. Go to the full soundboardwith more sound clips Search