Complete story — includes the ending
Megan, who was just gifted a brand new telescope, uses Josh's laptop and Drake's leather jacket without their permission. When Drake and Josh attempt to take their things back from Megan, she gets them sent to their room after convincing Walter that both of them bullied her and pushed her down. Enraged, the boys then hatch a plan to pull their own prank on Megan. Using photoshop, they insert a false image of an alien spaceship onto the laptop screen. Megan falls for the ruse and believes that aliens are invading. Drake and Josh then have Eric rewire their kitchen so that they can control the appliances inside, which frightens Megan and convinces her even further that aliens are real. Drake and Josh continue to try to prove to Megan that aliens are invading and, when Megan is left home alone one night, they pose as aliens and have their comeuppance on her. Just as Drake and Josh begin celebrating, though, a seemingly actual alien shows up that turns out to be a friend of Megan's and scares the duo away, much to Megan's delight. Leaving her brothers to their own fear as her retribution against them, Megan and her friend then hang out together in the house as her parents return, with the "alien" scaring Walter upon meeting him.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Drake & Josh episodes. HTML formatting and reference markers removed. · Content license