Die Fansite Seriously! berichtet, basierend auf Informationen von Devolver Digital, über das anstehende DLC-Paket "Fusion". Die Download-Erweiterung soll sämtliche Inhalte von Serious Sam HD: The First Encounter mit Serious Sam HD: The Second Encounter verschmelzen - und damit wird man auch die Spielmodi "Beast Hunt" und "My Burden" auf den Karten aus The First Encounter spielen können. Das "Fusion" DLC-Paket wird also beide Teile kombinieren. Außerdem stellen die Entwickler weitere Download-Erweiterungen in Aussicht, sofern sich eine ausreichend große Fangemeinde bildet.

The Fusion DLC Pack combines all the campaign and multiplayer levels from Serious Sam HD: The First Encounter into Serious Sam HD: The Second Encounter for the ultimate in classic first-person shooter mayhem. For the first time ever, enjoy new modes like Beast Hunt and My Burden using the classic maps from Serious Sam HD: The First Encounter.

The Fusion DLC Pack is priced at $9.99 on Steam and is available at no charge for users that own Serious Sam HD: The First Encounter. Boom!
-Adds 15 campaign levels and 7 versus levels from Serious Sam HD: First Encounter into Serious Sam HD: Second Encounter for an all new level of mayhem!
-Play all your favorite campaign and multiplayer maps from Serious Sam HD: The First Encounter in the new game modes found in Serious Sam HD: The Second Encounter!
-Includes Co-Op Modes for First Encounter Maps: Campaign and Coin-Op
-Includes Versus Modes for First Encounter Maps: Deathmatch, Beast Hunt, Capture the Flag, Instant Kill, Last Man Standing and My Burden
-Includes Team Modes for First Encounter Maps: Team Deathmatch, Team Beast Hunt, Capture the Flag, and Last Team Standing
-Use the powerful Serious Editor 3 to create your own levels based on content from Serious Sam HD: The First Encounter.