If you missed out on Dark Horse's Free Comic Book Day releases, the publisher is making all four stories available digitally through the end of the month -- for free, naturally -- via its Dark Horse Digital store and app for Android and iOS devices.

That's Buffy the Vampire Slayer/The Guild, by Andrew Chambliss and Georges Jeanty, and Felicia Day and Jonathan Case, and Star Wars, by Zack Whedon and Davidé Fabbri, and Serenity, by Whedon and Fabio Moon. Dark Horse's 2011 FCBD title, Baltimore/Criminal Macabre, is also still available.