10 South Park Fates Worse Than Death
3. Causing Armageddon
While Cartman shows off his new Trapper Keeper, the boys notice a strange man called Bill Cosby trying to steal it. When they confront him, Cosby explains he is a cyborg called BSM-471 from a dystopian future where Cartman's Trapper Keeper rules supreme. The cyborg was sent back in time to destroy Cartman's binder to prevent his calamitous future coming to fruition.
Not wanting to be held responsible for issuing in a new dark age, Cartman reluctantly agrees to have his Trapper Keeper destroyed. However, he convinces his mother to buy another Trapper Keeper the following day.
BSM-471 deduces this is the notebook that initiates Armageddon and implores Cartman to destroy this one as well. Cartman refuses and races home. When he places it by his PC, the Trapper Keeper merges with the computer's processor. As the Trapper Keeper becomes self-aware, it fuses with everything in its proximity, including Cartman, mutating him into into a gigantic Akira.
Fortunately, the Akira dissolves after it consumes Rosie O' Donnell, allowing Cartman to revert to normal. Unsurprisingly, Cartman is asked to apologise for nearly causing the apocalypse but the screen cuts to black before he has a chance to do so.