 From there , Crash crosses to the second of Cortex 's islands . Wumpa Island , hosting a large tree , has been long abandoned and there is nothing more than a jungle , a lizard @-@ infested city , dilapidated bridges high in the mountains , and the ruins of an ancient temple . However , having discovered that Crash was making his way across the islands , Cortex dispatches the deranged Ripper Roo on the island in a temple at the start of a creek . Crash manages to cross the river and , after avoiding contact with his razor @-@ sharp toenails , knocks Ripper Roo out cold beside a waterfall , and successfully makes his way through the city and the temples . Crash also defeats another of Cortex 's mutants , Koala Kong , in a volcanic cave mine before finally crossing to the Cortex Island . Crash then navigates the Cortex Power station , a huge power plant that provides Cortex 's castle with energy while polluting the nearby area . When he reaches the factory core , Crash battles and defeats the CEO of Cortex Power , Pinstripe Potoroo , damaging the power plant . 
