After switching bodies with a fish and almost got eaten by a cat, Antonio is now afraid of fish. Meanwhile at the Sanzu River a new villain, Serrator appears and offers help to Master Xandred in his plans and reveals that he was the one who sent Switchbeast to Master Xandred. Master Xandred is skeptical at first but when Serrator proves his loyalty to him he is accepted. Back at the Shiba House the team tries to help Antonio out with aversion therapy, Jayden is afraid of spiders, Mike is claustrophobic, and Mia is afraid of frogs. After that attempt fails, the Gap Sensor goes off and the Rangers rush into action. Antonio stays behind, and Mentor Ji shows him the LightZord, an ancient Zord that no Ranger has been able to master and Ji aks Antonio to see if he can unlock it. The Rangers deal with two Spitfangs before Serrator destroys the monsters and personally tests the Samurai rangers’ fighting skills. Serrator effortlessly defeats the Rangers in battle. At the last second, Antonio arrives with the Lightzord to drive Serrator off before enlarging Lightzord to take out the Papyrox. Later on the Rangers ask Antonio how he got over his fear, he tells them and they laugh as it is shown that Mentor Ji had snuck up behind Antonio and stuffed a sushi in his mouth having him eat it.
In a subplot Bulk and Spike attempt to rescue the stray kitten from the top of a tree but end up getting stuck there themselves.