Howard acquires a rare Jazz record ("Voodoo Scat" by Howlin' Jimmy Jefferson) which Vince, now a punk, bites in to, submitting to peer pressure from his new punk bandmates. It transpires that "Voodoo Scat" was made with a drop of Howlin' Jimmy Jefferson's blood, infecting Vince's blood stream with a corruptive rogue Jazz cell, causing him to embarrass his bandmates by scat singing at their gig in the Velvet Onion, which causes a riot. Vince is rushed back to the Nabootique, delirious, as the Jazz cell begins killing his cells. To save him, Naboo shrinks Howard and his blind friend Lester Corncrake down to microscopic size and injects them into Vince’s body to kill the invasive cell. Howard eventually succeeds in reaching the brain, where the Jazz cell begins to chase him. Howard and Lester catch it, and regrow to normal size. The Jazz cell is now also normal size, but is defeated by Lester, whom stabs him with Sid Vicious' safety pin, causing him to run away crying. (thetvdb.com)