Later , he would star or co-star in many feature films including Mel Brooks ' '' '' and `` Spaceballs '' , Charlton Heston 's `` Soylent Green '' and the Academy Award -- winning `` Charly '' .
Later he would star or co-star in many feature movies including Mel Brooks ' `` Robin Hood : Men in Tights '' , Charlton Heston 's `` Soylent Green '' and the Academy Award winning `` Charly '' .