In modern comic book movies, cameos are not only a regular source of fun for audiences, but also commonly used as a storytelling tool.
All that being said, if you happen to be a person who is expecting to see more from Justin Theroux in Joker 2 following his extremely minor part in Todd Phillips’ villain origin tale, we have some bad news for you.
With series often planned out in advance, filmmakers have sometimes used special appearances by known actors as a means of teasing future chapters – with the perfect example being Samuel L. Jackson’s debut as Nick Fury in the first Iron Man.