▁Bog art ▁was ▁suffering ▁at ▁the ▁time ▁from ▁what ▁would ▁be ▁diagn osed ▁as ▁es oph age al ▁cancer ▁and ▁thus ▁could ▁bare ly ▁be ▁heard ▁in ▁some ▁takes , ▁hence ▁the ▁need ▁for ▁Fre es ▁to ▁dub ▁in ▁his ▁voice . ▁He ▁also ▁vo iced ▁the ▁cars ▁in ▁the ▁comedy ▁The ▁Great ▁Race . ▁ ▁Un like ▁many ▁voice ▁actors ▁who ▁did ▁most ▁of ▁their ▁work ▁for ▁one ▁studio , ▁Fre es ▁worked ▁extens ively ▁with ▁at ▁least ▁nine ▁of ▁the ▁major ▁animation ▁production ▁companies ▁of ▁the ▁ 2 0 th ▁century : ▁W alt ▁Disney ▁Studios , ▁Warner ▁B ros ., ▁Walter ▁L ant z ▁Studios , ▁U PA , ▁H anna - Bar ber a , ▁Film ation , ▁Metro - G old w yn - M ayer , ▁De P atie - F rel eng ▁Enter pr ises , ▁Jay ▁Ward ▁Produ ctions , ▁Rank in / B ass , ▁and ▁Ruby - Spe ars . ▁ ▁Disney ▁Some ▁of ▁Fre es ' ▁most ▁memor able ▁voices ▁were ▁for ▁various ▁Disney ▁projects . ▁Fre es ▁vo iced ▁Disney ' s ▁Professor ▁Ludwig ▁Von ▁Dra ke ▁in ▁eigh teen ▁episodes ▁of ▁the ▁Disney ▁anth ology ▁television ▁series , ▁beginning ▁with ▁the ▁first ▁episode ▁of ▁the ▁newly ▁renamed ▁W alt ▁Disney ' s ▁Wonder ful ▁World ▁of ▁Color ▁on ▁September ▁ 2 4 , ▁ 1 9 6 1 . ▁The ▁character ▁also ▁appeared ▁on ▁many ▁Disney land ▁Records . ▁Von ▁Dra ke ' s ▁intro duct ory ▁cart oon ,