The Crossbow Incident - S1.E73

Peter and So-So evade a missile using the time-space machine and end up meeting William Tell. Because William fails to remove his hat in front of the king, he is given the punishment to shoot an apple off his son's head. Since it was Peter's fault, William makes Peter take his place and shoot an apple off So-So's head. Peter misses and is pursued by both the king and William. His hippo hurricane holler causes an avalanche, which enables them to escape