Underneath the skin of every folksy anthropomorphic guitar-playing bear and rambunctious little alien, there is a creepy metal skeleton. 

Everything from the xenomorph from the Alien movies to cutesy Disney characters on theme park rides is powered by animatronics. All it takes is a single peek beneath these robots’ rubber skin to shatter the illusion.

Whether these mechanical innards give you nightmares for the next week or have you rubbing your hands together in nerdy glee, they are sure to fascinate you.