S3·E1 The Long Hot Mansion

One day Turner is mysteriously returned to his small self. Everyone assumes that the effect has worn off, and Harry should return to his normal state. He didn't though, and it turns out the meteor is causing strange things to happen at the mansion. Fred tries to figure out a way to fix the problem but nothing works. He ends up fighting the meteor after it tried to go after the family. He wins, and the meteor stops messing with the house.