S4·E20 The Posei-Dam Adventure

A raging volnado' (half volcano, half tornado) capsizes the Beavers dam during a party. Everyone escapes but Dag and Truckee. Handcuffed together, the two antagonists must escape from the sinking upside down dam. Meanwhile, Norb and the rest of the gang party in the volnado shelter not missing Dag or Truckee at all.