original question: What literary series was [Joss Whedon] an author of?
answer: wicked willow, the lost slayer, unseen...
answer type: Literary Series.
auxiliary information: Joseph Hill "Joss" Whedon is an American screenwriter, film and television director, film and television producer, comic book author and composer. He is the founder of Mutant Enemy Productions and co-founder of Bellwether Pictures, and is best known as the creator of the television series Buffy the Vampire Slayer, Angel, Firefly, Dollhouse and Agents of S.H.I.E.L.D.. Whedon co-wrote Toy Story, wrote and directed Serenity, co-wrote and directed Dr. Horrible's Sing-Along Blog, co-wrote and produced The Cabin in the Woods, and wrote and directed The Avengers and its sequel Avengers: Age of Ultron.
[Joss Whedon] was the author of which literary series?