Potentially the greatest mystery hook in the history of Metal Gear, Peace Walker opens with Snake hearing a voice on tape that sounds just like The Boss - who also just happens to be the mentor he executed to fulfil his mission in MGS 3: Snake Eater. There's just no way she's still alive, no way in hell, we all thought. And we were right, she wasn't - the voice was an A.I. construct designed to replicate Boss by one Dr. Strangelove, a revolutionary scientist who had essentially fallen in love with her, creating the 'Mammal Pod'; a piloting program for a new Metal Gear that could replicate her through thought patterns and an actual voice. That's not even the best bit. Later in the game, after the pod is installed and this new Metal Gear, Peace Walker, is about to fire its payload, The Boss' reformed will takes over the machine and forces it into a lake, drowning the mech and saving the western hemisphere in one fell swoop. https://www.youtube.com/watch?v=se4zdRqXiLY And you thought Raiden coming back as a cyborg was far-fetched. What's your biggest WTF moment in Metal Gear history? Let us know in the comments!