Metamorphosis Alpha Treasure Chest - Rules of Play says:

This limited-time Treasure Chest contains the Metamorphosis Alpha collector’s edition plus 12 supplements, at an introductory price of only $50! You’ll save more than 60% off the original price! If you enjoy the products we encourage you to check out the rest of the line! But act fast! This Treasure Chest is only available around Free RPG Day. When they’re gone, they’re gone!

Contents: Metamorphosis Alpha Collector’s Edition, MA GM Screen, The Captain’s Table, The Level of the Lost, Death Ziggurat in Zero-G, Warden Adventures, What are the Prisoners of Rec-Loc-119?, Creatures and Gadgets, The Mutation Manual, The Warden Armory, The Long Hard Mile, Book of Handouts, Robots Among Us.