My bad, it's been many years since I've scene the pilot episode. Wasn't that originally a movie? The pilot was a movie I think. There weren't any in the main series. The episode where Terrence has Eduardo fight at the junkyard were just random imaginary friends. Nothing as extreme as that first episode IF.

As I understand it, House of Bloo's was originally aired as three separate episodes which CN later edited together to form a movie. I didn't discover the show until several months after it debuted so I've only seen the movie version but I think they have the same content.

That's correct. The premiere was labeled as the first three episodes of the show.