▁former ▁den izen ▁of ▁Kingdom ▁C um , ▁where ▁he ▁worked ▁as ▁a ▁high - profile ▁scient ist . ▁After ▁an ▁experiment ▁involving ▁his ▁own ▁DNA ▁back f ired ▁on ▁him , ▁his ▁body ▁under w ent ▁severe ▁mut ations , ▁transform ing ▁him ▁into ▁a ▁green - sk inned , ▁sh ri vel led , ▁pot ato - head ed ▁creature . ▁He ▁was ▁ban ished ▁from ▁Kingdom ▁C um ▁and ▁e ject ed ▁into ▁space ▁along ▁with ▁the ▁remains ▁of ▁his ▁failed ▁experiment . ▁After ▁crash ▁landing ▁on ▁an ▁island ▁off ▁the ▁coast ▁of ▁Australia , ▁Clar ence ▁accident ally ▁dro ps ▁his ▁experimental ▁fluid ▁into ▁a ▁large ▁rav ine , ▁which ▁mut ates ▁over ▁time ▁and ▁becomes ▁the ▁source ▁of ▁the ▁Cho om ah s . ▁While ▁on ▁what ▁then ▁becomes ▁Cho om ah ▁Island , ▁Clar ence ▁meets ▁S ass y ▁and ▁Don ny ▁who ▁offer ▁him ▁a ▁home ▁in ▁Brown ▁Town . ▁ ▁Clar ence ▁works ▁as ▁the ▁local ▁mail man ▁in ▁Brown ▁Town ▁as ▁well ▁as ▁a ▁general ▁dogs body ▁in ▁Don ny ' s ▁shop . ▁Clar ence ▁is ▁one ▁of ▁the ▁most ▁good - n ature d ▁and ▁kind ▁people ▁in ▁the ▁show ▁but ▁his ▁attempts ▁at ▁friendship ▁are ▁usually ▁not ▁reci proc ated ▁as ▁most ▁of ▁the ▁other ▁characters ▁find ▁him ▁ir rit ating ▁and ▁anno ying . ▁In ▁particular , ▁Le z ▁and ▁Don ny ▁are ▁very ▁host ile ▁towards ▁Clar ence . ▁At ▁the ▁end ▁of ▁Cho om ah ▁Island ▁ 3