Tuba Triumph.After witnessing a boy named Joey being bullied for playing a tuba and throw it away, Ravi accompanies him while reflecting on the fact his mother refuses to allow him any hobbies. Meanwhile, Roxy uses the tuba to creates Tubatron, who can produce deafening sound blasts, intending to get data on Devon's cheetah speed before she and the robot engage the Rangers and escape. Ravi teaches Joey some karate moves and presents a new tuba to him, advising the lad to stand up for himself...