Yes that is the episode The Return of the Fellowship of the Ring to the Two Towers. And sorry I have to disagree with Cartman, I never watched one of the Lord of the Rings movies.
The Return of the Fellowship of the Ring to the Two Towers.
Watch here -
the return of the fellowship of the ring?
s6e13
All I can remember is that the boys (I think it was in South Park) came across a group of kids playing Harry Potter and one of the boys said "We're playing Harry Potter." and someone (Cartman) I think says something like "Harry Potter stinks."
