A key issue noted for First appearance of Bastet and First appearance of Kasha. X-Factor #221 was published by Marvel Comics on August 1, 2011, as part of a series that began in 2006. Peter David writes, and art comes from Brian Reber, David Yardin and Dennis Calero. This 36-page issue features Wolfsbane, Madrox, Siryn, Rictor and Shatterstar, among 13 characters cataloged on VerseDB.