Who played Ty Webb in 'Caddyshack'?

Who played Gertie in 'E.T. the Extra-Terrestrial'? In which film is Gertie a character? Who played Carl Spackler in 'Caddyshack'? In which film is Carl Spackler a character? Who played John "Bluto" Blutarsky in 'Animal House'? In which film is John "Bluto" Blutarsky a character? Who played Jake Blues in 'The Blues Brothers'? In which film is Jake Blues a character?