Kirsten Bell and Idina Menzel reprise their voice-acting roles as Anna and Elsa in “Frozen 2,” playing at the Liberty Theater, just in time for Christmas break.

In this sequel to “Frozen,” Anna, Elsa, Kristoff, Olaf and Sven leave Arendelle to travel to the ancient, autumn-bound forest of an enchanted land they heard of from their father when they were small. With Arendelle threatened...