The first indication of time travel in South Park was in 4th grade when (among other things)
Cartman’s Dawson’s Creek Trapper Keeper Futura S2000 has designs on killing Kenny
and taking over the world, but fortunately a robot from the future has come back to protect
and serve.
I have come to destroy that trapper keeper because it was the Dawson’s Creek Trapper
Keeper that belongs to an Eric Cartman in South Park which three years from now manifests
itself into an omnipotent super being and destroys all of hu-manity.