▁where ▁its ▁life ▁force ▁is ▁linked ▁to ▁the ▁Mon ster ▁D ough nut ▁Sh op , ▁as ▁another ▁one ▁pop s ▁up ▁every ▁time ▁the ▁H yd ra ▁reg rows ▁a ▁head . ▁It ▁was ▁destroyed ▁by ▁the ▁can n ons ▁of ▁the ▁CSS ▁B irmingham . ▁In ▁The ▁Mark ▁of ▁Ath ena , ▁Per cy ▁f ights ▁a ▁H yd ra ▁when ▁he , ▁Jason , ▁and ▁Pi per ▁are ▁on ▁a ▁mission ▁to ▁rescue ▁N ico ▁from ▁E ph ial tes ▁and ▁Ot is . ▁In ▁The ▁Light ning ▁Th ief ▁film , ▁the ▁creature ▁takes ▁the ▁form ▁of ▁five ▁jan itors ▁( play ed ▁by ▁Tom ▁Pick ett , ▁Keith ▁Dallas , ▁V . J . ▁Del os - R ey es , ▁Sp encer ▁At kin son , ▁and ▁Tim ▁A as ) ▁in ▁the ▁Par then on ▁rep lica ▁in ▁Tennessee ▁and ▁refers ▁himself ▁as ▁" We ." ▁The ▁H yd ra ▁is ▁ultimately ▁defeated ▁by ▁the ▁use ▁of ▁Med usa ' s ▁head . ▁ ▁Kar po i ▁– ▁Gra in ▁spirits ▁who ▁are ▁the ▁size ▁of ▁to dd lers . ▁While ▁many ▁of ▁them ▁are ▁male vol ent ▁thanks ▁to ▁their ▁service ▁to ▁G ae a , ▁children ▁of ▁Dem eter ▁are ▁apparently ▁also ▁capable ▁of ▁sum mon ing ▁kar po i . ▁ ▁Pe aches ▁– ▁A ▁friendly ▁Kar po i ▁that ▁res emb les ▁a ▁p ud gy ▁human ▁to dd ler ▁with ▁green ▁eyes ▁and ▁green ▁hair . ▁He ▁is ▁controlled ▁by ▁Meg