The Canadian Conspiracy was a 1985 mockumentary illustrating a supposed conspiracy to infiltrate American culture through employment in the entertainment industry. It featured John Candy, Lorne Greene, Monty Hall, Doug Henning, Margot Kidder, Eugene Levy, Rich Little, Howie Mandel, Lorne Michaels, Anne Murray, Leslie Nielsen, Morley Safer, William Shatner, Martin Short, Alan Thicke and Dave Thomas.
I remember watching The Canadian Conspiracy on CityTV in the 80s and was pleased to find it in its entirety on YouTube.