Task: Question Answering
Input (English): Context: R.O.B. has appeared as a cameo character in various video games, such as StarTropics, Kirby's Dream Land 3, the Star Fox series, the Mario Kart series, the WarioWare series, the F-Zero series, the Super Smash Bros. series, and Viewtiful Joe; his head appears in Pikmin 2, where it is referred to as ''Remembered Old Buddy''. 
 Question: To which fictional work does R.O.B. belong in?
Output (English): super smash bros.