In July 2008, Day starred as Penny in the three-part web-based musical "Dr. Horrible's Sing-Along Blog" (created by Joss Whedon, who also created "Dollhouse" and "Buffy the Vampire Slayer", in which Day had parts). Day was featured as a patient in the episode "Not Cancer" of the medical drama "House", and had a guest starring role in the sci-fi drama "Dollhouse"s unaired episode "Epitaph One", as well as its series finale "." Also in 2008, Day was featured in a series of commercials for Sears Blue Crew. She also appeared in the first of the revitalized Cheetos commercials.