Avengers: Age of Ultron is nearly here, and there has never been a comic book movie so jam-packed with superheroes and villains new and old. In addition to the Avengers we all know and love, new characters like the Vision, Ultron, Scarlet Witch and Quicksilver will also be making their debuts.

If you can't wait to see the movie or just want to learn more about the various new characters who will soon be taking the Marvel Cinematic Universe by storm, Marvel has a deal for you. By using the promo code ULTRON at the checkout page for Marvel Unlimited, you can get access to more than 15,000 digital comics completely free for one month.

For those not in the know, Marvel Unlimited in Marvel's digital comics service that gives users near unlimited access to Marvel's vast comic book collection via a variety of devices. The service usually costs around $9.99 a month or $69 a year.

One cool feature of Marvel Unlimited is the "discover" section of the service. Every so often Marvel handpicks characters, events and storylines to highlight for newcomers and comic veterans alike. This month the spotlight is focused firmly on the characters of Avengers: Age of Ultron. Want to know the history of Scarlet Witch and Quicksilver? Marvel makes it easy. You can also read the Age of Ultron event comic from which the new movie gets its name.

And after you see Age of Ultron in theaters you will no doubt be ready to see Captain America: Civil War. Marvel Unlimited has you covered there as well, as it is currently spotlighting the Civil War event storyline from which next summer's blockbuster will be based.

Star Wars fans also have a reason to check out the service. Marvel recently added more than 500 Star Wars comics to Unlimited, with more on the way.

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