10 Hidden Video Game Bosses You Weren't Supposed To See

4. The Illusive Man - Mass Effect 3

Fans have had a lot to say about Mass Effect 3's highly controversial ending, and one of the many sticking points was the lack of an outright boss battle against the Illusive Man, who is merely confronted in a dialogue-driven cutscene.

But BioWare originally planned to have players take him down in a more typical boss fight, as players have discovered by digging into Mass Effect 3's databanks.

The original release of the game includes unused audio from the Illusive Man where he seems to mock the player's attempts to attack him, and there's also a clip of him roaring monstrously.

This coheres perfectly with released concept art for a reaper-fied Illusive Man originally planned for the end of the game, and writer Mac Walters re-iterated to Eurogamer last year that it originally ended with a Reaper Illusive Man boss battle not unlike the bombastic fight at the end of the second game.

While we technically had a boss fight against the Illusive Man - albeit a spoken one - only a few scattered remnants remain of BioWare's original vision for the battle, before deciding it didn't really fit the character or the story they were telling.