outsider wrote:The Chitauri (and by extension the Avengers movie) are the reason for this TV show, so it makes sense they would revisit that well as many times as they can.
True. But as the next film will be the Avengers vs. Ultron, the Chitauri seem to have be on the sidelines now as far as the movies involving Earth's Mightiest Heroes go. (Guardians of the Galaxy notwithstanding. Haven't paid too much attention to what's up with that movie, to be honest.).
The Chitauri make a perfect Big Bad because their shape-shifting abilities allow for their continued use without breaking the budget. There's only need to show their true form only once or twice during the season.