A rumor spreads around Greenit that the magical spring water has become polluted. Due to the rumor the animals stop drinking from the magical spring water. Without drinking the water the animals of Greenit start to age and become old. Even Yoohoo and his friends begin to age and they also lose their super powers. Big Boss, who also hears this rumor, does not drink from the water either.

Within the Death Forest there is a cemetery. One day, because of Oops and Koops, the ghosts of the cemetery are awoken. Yoohoo becomes friends with the little flying squirrel ghost and introduces it to his other friends. In return, the little flying squirrel ghost wants to introduce Yoohoo to other ghost friends and takes him to meet them.

Oops and Koops are tired of being ordered around and demands a vacation. Big Boss fires them instead and Oops and Koops take the opportunity to go on a vacation. Big Boss on the other hand begins to look for animals to replace Oops and Koops. He hires twin cat brothers but they outsmart Big Boss! He then hires an impetuous rat but finds it too stressful to work with it.