Wicked the musical offers a "backstory" to the Wizard of Oz, in other words a buoyantly creative version of what happens to Elphaba, the supposedly 'wicked' witch and Glinda, the reputedly good witch during the college years. Their buddy story is only one of several storylines and subplots in a carefully constructed, surprise-filled musical adventure. Read more about the story of the witches of Oz.
Wicked is not a children's show. Young people over the age of 10 are going wild for it. The applause has been tremendous during matinee crowds with large numbers of school or youth groups in the audiences. There's discrimination issues, love triangles, fascinating set pieces and costumes, powerfully belted songs, tender songs, characters who are transformed through time, and a storyline plotted like a mystery novel. No foul language and only playful violence.
Children age four and under are not admitted in the show. The production has received some messages about some children who were afraid of the winged dragon, flying monkey, the OZ head, and the OZ head's voice, so perhaps inform children about the show. maybe get the music for it before hand, and that way Wicked can be enjoyable for everyone!