Sym-Bionic Titan Season 1 Episode 15

Lance learns how to play the guitar, and General Steel sends a spy to Sherman High whom Octus convinces that there is connection between Titan and the school. A dragon-like Mutraddi, which was defeated earlier by Titan, comes back as a severed head during a concert but is destroyed by Illana and Octus with a hologram of the Manus armor, to give Lance an alibi with the General being at the concert.