The story follows Anna, Elsa, Olaf, Kristoff, and Sven on an epic quest to restore the glimmer of the Northern Lights after they mysteriously disappear from the sky above Arendelle. Their journey takes them to the far north of the kingdom, reaching the Great Glacier to find the cause of the phenomenon's absence. Lego Disney Frozen: Northern Lights (2016) - IMDb

The feature you are referring to is likely (often titled Frozen: Luzes de Inverno in Portuguese-speaking regions). While parts of the project began in 2016, it was widely available and broadcast as a compiled special throughout 2017. Feature Overview Duration: 22 minutes (compiled special) Rating: ~5.6/10 on IMDb

Features the original film's cast, including Kristen Bell (Anna), Idina Menzel (Elsa), Josh Gad (Olaf), and Jonathan Groff (Kristoff).

Originally released as four seven-minute animated shorts that were later compiled into a single television special for the Disney Channel . Plot Summary