An incoming storm threatens to cut the siblings' Alaska trip short. But surprise news from Billy sends them on a quest to reunite with an old friend. Noah struggles to train his new "war horse," Prometheus.

After the summer's devastating wildfire, the Wolfpack is eager to reestablish roots back on their mountain ranch. As they race to build a new "Boomtown" inspired basecamp, an unexpected tragedy strikes and the family must grieve one of its own.

The Browns rally to bring home Billy's beloved animals to the mountain as a dose of bush medicine. And as Bear and Raiven give their relationship another try, the young father welcomes son River to North Star for the very first time.