Sons a Witches This year at the traditional Halloween get together, a witch casts a spell that terrorizes the town and ruins Halloween for the boys. Details Casts Title Sons a Witches Genres Animation Comedy Release Date 2017-10-25 Episode Runtime 00 Hours 22 Minutes Season Number 21 Episode Number 6 Production Companies South Park Studios, Comedy Central, Braniff Productions, MTV Entertainment Studios, Parker-Stone Productions Trey Parker Eric Cartman / Stan Mars? Matt Stone Kyle Broflovski / Kenny ? Mona Marshall Sheila Broflovski (voice) April Stewart Sharon Marsh (voice) Jennifer Howell Bebe Stevens (voice)