Just when the Power Rangers are learning to combine forces as a team, a devious plot threatens to destroy their friendship - and the fate of the Rangers. Dustin's new motocross buds seem too cool to be true to Tori and Shane, but Dustin can't resist their high-speed lifestyle. It's no coincidence that the trouble begins as soon as they arrive, from atrocious space monster attacks to the arrival of two mysterious Thunder Rangers who steal their prized Tsunami Cycles! Dustin is forced to take a hard look at the meaning of friendship when Sensei is captured. It'll take all the muscle, courage, and ingenuity of a combined Power Rangers team to mount an awesome Megazord battle, defeat ferocious Ninja Spirits and journey to the Mountain of Lost Ninjas to rescue Sensei and save the world!