Can i use copyrighted stuff in my free game?

I really want to make a ultimate anime fighting game (They never leave Japan and come to the U.S.) and if i use characters like Goku or Naruto can i be sued for copyright? I intend to make all the models myself but for voices i need to take files from other games with these characters in them. But the game will be 100% free to play. and i remember hearing somewhere that if its free you can use copyrighted material without worry but now i cant find that video so im asking if it would be ok?