A human-powered portable generator; a green water purification system using water hyacinths to remove harmful medications from water; a motorized bubble maker; a ping-pong-paddle race.
The Los Angeles River sweeps away a dog and its owner is forced to make a life-or-death decision; a training exercise on a frozen lake turns into a real-life rescue for first responders.
A powerful gang that Walker once helped to bust stalks the Ranger in hopes of getting revenge while Alex prepares to give birth; Trivette asks his old flame to share his life.
It's graduation day and the Walker family is hopeful about the future, until Cordell goes missing; the rangers have all hands on deck to bring Cordell home safely, but Stella has ideas of her own on how she can help.
While Cassie and James lead the charge to find Walker, the situation goes from bad to worse when Liam also goes missing; Stella and August pursue a lead of their own.
A Devore officer asks Janeway for asylum after he intercepts Voyager to search for two families of alien refugees who have been rescued by the ship's crew.