A treacherous little flee who has been stinging our three friends, is finally caught. To save itself, the flea pretends to be Mapà, who was transformed into a flea by a nasty witch… A kiss, however, might save it, and so Rosmary kisses the flea and they all expect to see it turn into Mapà, but the flea escapes and goes on being what it was: a shrewd, disloyal little flea.