Niagara Brawls

This is confirmed to be the nineteenth episode of Total Drama World Tour. http://www.abc.net.au/tv/guide/abc3/201008/programs/ZX0917A019D2010-08-23T173100.htm?program=Total%20Drama%20World%20Tour

Recap
The contestants have a rather rude awakening on their return home to Canada - because they are dropped into the rushing waters of the Great Lakes, just meters from the destructive wonder of Niagara Falls!