Jayden is poisoned by Octoroo during his attempt to discover the Red Ranger's sealing symbol, which can lock away Master Xandred forever.

It's mixed-up mayhem when the Rangers encounter Switchbeast, a Nighlok who can trap people's spirits inside common objects. When the monster does this to four of the Rangers, Mike and Emily must figure out how to defeat him on their own.

When Mia's younger brother comes to town to try and convince her to sing lead in his band, the reunion is anything but sweet music. Meanwhile, Serrator once again attacks the city.

Halloween gets spooktacular when an evil Nighlok invades the Samurai Rangers' dreams and turns them into nightmares.

The alien invaders send Scaraba, an alien scientist, down to Earth to study the human race. Meanwhile, Troy finds himself face-to-face with Creepox.

While the Rangers are unsure about how to work with the newly-arrived Robo Knight, Vrak captures the robotic Ranger in an attempt to reprogram him for his own nefarious purposes.

The Rangers discover the cave where Koda and his family once lived. Questioning the wise words of his Grandfather, Koda opens a section of the cave he was told to never enter, allowing an ancient monster to escape.