Humans from the year 4035 are arriving in droves in South Park! Everything gets a little too crowded when people from the future arrive through a recently discovered time portal. When the boys try to earn some extra money, the time immigrants, who are willing to do the same work for next to nothing, take their jobs.
This one started out funny, but got stupid later. I didn't see anyone using abstinence to prevent an overpopulated future. What cement-heads!

I was glad to see Cartman negotiating again after two years or so.