The Great Electron, after escaping from the Island of Inventors, settled on the planet Mango and invented phantomization. He kidnaps Agnieszka and offers her to the governor, who desires a daughter. Meanwhile, Ambroży Kleks lives in a wildlife reserve because he believes the children have forgotten about him. Agnieszka's friend Groszek, along with classmates and the robot Silver, find Mr. Kleks and form a rescue team. Joining them are Melośmiacz and Max Benson, Groszek's father. Once again, Mr. Kleks will have to face the Great Electron and his minion Alojzy Bąbel...