Watch Wish Upon a Unicorn (2020) HD Full Movie Free on SolarMovie. Watch Wish Upon a Unicorn (2020) online free. After 8-year-old Mia loses her mother, her family moves to Grandma's Montana ranch. In the woods, Mi...After 8-year-old Mia loses her mother, her family moves to Grandma's Montana ranch. In the woods, Mia discovers a unicorn colt: a magical creature that brings luck to anyone who believes in it.