Sigma's Invasion was Teppen's nineteenth expansion, and the third and final part of the "Echoes of the Lost Civilization" trilogy.
Series and Characters included in this expansion (Bold indicates a series new to Teppen. Characters with a Σ next to them only appear as Mirage Soldiers.)
- Bionic Commando: BioReign Soldier
- CROSS×BEATS: Akatsuki
- Darkstalkers: Jon TalbainΣ
- Devil May Cry: Vergil, Lady, Lucia, Matier, DanteΣ
- Dino Crisis: Regina, Dylan Morton, David Falk
- Mega Man X: X, Cinnamon, Massimo, Meta Capsule, Rideroid G, Bospider, Bit, Byte, Sigma
- Monster Hunter: Kayamba, RajangΣ
- Ōkami: Oki, Kai, Tuskle, Samickle
- Resident Evil: Shona, Harley, Tweed, Dee-Ay, Party Girl, Willow, Moira Burton, Barry Burton, Bruce McGivern, Fong Ling, Leon S. Kennedy, Ada Wongnote
- Sengoku Basara: Goto Matabei, Katakura Kojuro, Date MasamuneΣ
- Street Fighter: Sean Matsuda, Laura Matsuda, Alex, Zangiefnote , Rainbow Mika, Guy, Maki Genryusai, Zeku, Ibuki, Guile, Juni, Li-Fen, Chun-LiΣ , Cammy WhiteΣ
- Strider: HiryuΣ