Sky, Syd and Bridge, all B-Squad cadets, are about to be promoted to B Squad Power Rangers, which means they'll get morphers. First they have to deal with some street thieves, Jack and Z. Meanwhile, Emperor Gruumm plots his attack on Earth.

Jack finds out that being the Red Ranger also means being the leader of the team. The A-Squad  sent into space to fight the Troobians when Gruumm launches an attack in a nearby nebula. With the B-Squad left as Earth's defenders, the others begin to doubt Jack's competence as their leader. Gruumm's assistant, the evil child Mora, helps him by drawing evil creatures and bringing them to life.