T2DEF was produced through a team effort by the following individuals, who contributed their time and talent in the following areas:
- Daryn L. Waite AKA PeppyFool (Team Leader): original concept, coding, 23 maps, models, webmaster, graphics, voices (Joe and Albert).
- John Visser AKA Baal-Peor: Level design (1 map), textures
- Daniel Strandberg AKA Wolk: 5 original score soundtracks
- James Burton AKA Lord Mantrid: skins, voices (troopers, Oscar, and Vincent)
- Christopher Davies AKA some_bloke: skin and voice (Ethan Cooke)
- Andrew Farrar AKA Thief_3_Wannabe: sound effects and voices (troopers, Sanjay, Lukas, and final boss)
- Dave Robinson AKA Johnny_Blaze: 8 original score soundtracks
- Nick Peters AKA Space-Cowboy: voice (Walter)
- Bruno Tavares: voice (Gordon)
- Johannes Dorn AKA Pimperator: Level design (1 map), textures, and German translations
