15. The Demonator

Complete story — includes the ending

Drake and Josh plan to ride a new roller coaster called "The Demonator" on its opening day. However, they instead find out that the ride will actually open that night. Complicating things further, the boys are then tasked by Audrey and Walter to stay home and watch over their great-grandfather, Papa Nichols, who recently had surgery, while Walter and Audrey attend an awards show. As a way out, Drake calls two friends from school, Craig Ramirez and Eric Blonowitz, to come over and convinces them to watch Papa Nichols while he, Josh, and Megan – who has blackmailed Drake and Josh into taking her – go off to ride the Demonator. Sometime later, Papa Nichols wakes up disoriented, believing that he is back in World War II and that Craig and Eric are German soldiers, in which he proceeds to attack them and evens breaks Eric's cell phone when he believes it to be a weapon. Meanwhile, while waiting to ride the Demonator, Drake, Josh and Megan are bumped to the back of the line after Josh attempts to reclaim his spot in line after using the restroom, upsetting the other parkgoers. Later, Drake and Josh are bumped back in line once again after Josh is falsely accused of messing with the amusement park's mascot, wherein Megan takes the opportunity to remain in line by pretending not to know them. After Megan rides the Demonator first, Drake and Josh finally get to ride the Demonator and arrive home just seconds before Audrey and Walter do. Suddenly, Papa Nichols wakes up and punches Walter, knocking him out and calling him a German.