Listen to the sound clip The original version of team fortress 2 was a very different game, being much more similar to the first and looking more like day of defeat then the tf2 we know and love, There was also going to be a commander class that would command the team to do certain objectives, eventually these version of the game was scrapped and then at one point there were aliens or some shit and then the version of tf2 we know and love came in fruition. So that's how from Engineer (Team Fortress 2) TTS Computer AI Voice: