Watch The Worst Witch Episode 1 HD Full Free on SolarMovie. Watch The Worst Witch tv series online free. The adventures of Mildred Hubble, a witch attending Cackles Academy. She's called the "Worst Witch" ...The adventures of Mildred Hubble, a witch attending Cackles Academy. She's called the "Worst Witch" because she's always caught getting into trouble.