Trailer Roundup: Watch these previews for 'Avengers: Age Of Ultron,' 'Insidious: Chapter 3,' 'The Gambler' and more in case you missed them debuting this week!

This week we saw brand new trailers for a handful of movies, including Avengers: Age of Ultron, Insidious: Chapter 3, The Gambler and more. Let's take a look at these great film previews below in our weekly trailer roundup!

Perhaps the biggest trailer to drop this week - okay it was definitely the biggest trailer to drop this week - had to be the "leaked" Avengers: Age of Ultron teaser. We don't really think it was "leaked, " mainly because it showed up on Marvel's YouTube page. Regardless of a leak or whatever happened, this teaser is easily a top contender for best trailer of the year.

Plenty of mysteries come out of this trailer (like who is Andy Serkis playing in the film?), but the main takeaway is just how menacing James Spader sounds as Ultron. What's in store for the Avengers? We'll have to wait and see!

Watch this great teaser trailer for Avengers: Age of Ultron right here:

Insidious: Chapter 3 is technically a prequel to the previous films in the horror movie franchise, thus inviting audiences into the terrifying past. Expect to scream and get creeped out by this new trailer

Check out the first trailer for Insidious: Chapter 3 here!

Mark Wahlberg stars in The Gambler, a remake of the 1974 film of the same name about an English professor that falls deep into a killer habit and trouble. This week we were treated to a Red-Band trailer for the new movie, full of NSFW material - so you've been wraned!

Check out the Red-Band trailer for The Gambler HERE!

Did you see any other movie trailers you thought would be fun to share? Let us know in the comments section below!