Wendy and the other magic users in the forest find that their wands, spellbooks, etc., have been mysteriously swapped around. The culprits are the Invisimen, who reveal themselves only to Wendy.; After Wendy tells the others about the Invisimen, they try to lash out at the invisible aliens, who tell Wendy their story--they've been deported from their home planet. Wendy encourages them to stay in the forest, since no one who means them harm can see them anyway.; Nature writers Marvin and Mabel Muddle try to get Casper to demonstrate booing for them.; Spooky meets an obnoxious little bird who wants to be just like him, but they find they don't get along and part ways.; Two sorcerers test their new teleporter on Wendy; she gets her hands on the device and turns the tables on them.; When Wendy gives a sad little tree the ability to walk it gets into all kinds of trouble. She puts it back in the ground but gets some bluebirds to build a nest in it so it won't get lonely.; Wendy's aunts try to mess up her good spells but inadvertently make them better.; Casper watches Mrs. McScream's timid ghost puppy Misty while she's on vacation, and helps him to be (a little) less timid.; Spooky encounters a shopkeeper who has invented a ghost call.; A small lake is sad because it can't fly with the clouds, so Wendy gives it that ability, but when she sees that she's left the fish with no water, she brings the lake back.; Wendy sends her aunts' brew vapor into orbit, where it dissolves space junk.; Casper's sneeze gets a little boy in trouble.; Spooky has a sore throat and can't boo, so he has to use ingenuity to scare a man at the beach.; Casper is doing some people-watching while invisible, when a sudden gust of wind covers him with flour and he scares the people he was watching.; After a TV western inspires Wendy to put a horse head on her broom, a bully tries to steal it.; After watching children ride by on a scooter, roller skates, and a bicycle, Wendy puts wheels on her broom.