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Sam is getting ready for her "Save the Frogs" campaign. She, Danny, and Tucker are bringing the material to the school auditorium, but then The Box Ghost appears out of a box that Danny is carrying. Danny tells Sam and Tuck to go while he is fighting The Box Ghost. Surprisingly, The Box Ghost beats Danny. He pushes Danny through the wall, Danny goes intangible, then goes back to human mode by accident. Danny is knocked into a pile of costumes on the auditorium, the whole school sees him and they laugh hysterically. Sam's campaign was ruined.
Danny is assigned a new locker, because The Box Ghost trashed his. He's assigned to locker 724, where a ghost nerd, Sydney Poindexter lurks watching for bullies. Dash picks on Danny because of the campaign, then Danny uses his ghost powers to get some ghostly vengeance. Poindexter sees Danny as the bully.
Later, Dash once again embarrasses Danny in the cafeteria. So, again, Danny wants revenge. Danny puts frogs in Dash's pants, then Poindexter's portal to the real world was opened. He wants to get revenge on Danny for bullying Dash. Poindexter learns that Danny is a 'half-a' so he switches bodies with him after a long fight. Danny is in Poindexter's body the 50's ghost world, and Poindexter is in Danny's body in the real world.
Danny (in Poindexter's body) has to figure out a way to send a message to Tucker and Sam. Poindexter (in Danny's body) is having a great time in Danny's body, Dash and Kwan let him play at the football game. At the same time, Jack and Maddie are hunting down the school for ghosts.
Danny manages to send a message to Tucker and Sam. They trick Poindexter into going back in the 50's world. Danny (Poindexter's body) and Poindexter (Danny's body) are fighting, all the people think that Poindexter is actually beating up the half-a, Danny. Danny regains his body, then breaks the portal to the human world. Poindexter becomes popular in his world and Danny learns his lesson not to bully anyone anymore, even Dash.