Mimi Kuzyk played Siobhan Tilly, the mother of Sylvia Tilly, in “Runaway,” the first Star Trek: Short Treks episode. The Canadian actress is a movie and TV veteran who has appeared in the likes of Hill Street Blues, Wolf, Quantum Leap, Total Recall 2070, Lost and Delirious, The Day After Tomorrow, Castle, Special Correspondents, Unreal and Shadowhunters.