While many comic books based on the Buffy the Vampire Slayer television series were published while the show aired, they are not all considered canonical. Some feature characters who do not appear in the television series, such as the Tales of the Slayers and Tales of the Vampires miniseries. The first series of books were published by Dark Horse Comics between 1998 and 2004, initially in comic format and later collected into volumes of trade paperbacks. A small number of Buffy comics were not included in trade paperbacks, such as the titles Giles, Jonathan, and Reunion. Following the television series finale, Dark Horse began releasing new books titled Season Eight, Season Nine, and Season Ten, along with various spin-offs, written and/or supervised by creator Joss Whedon. These books were officially recognized as canon. In 2005, Dark Horse allowed the rights to produce comics for Buffy's companion series Angel to lapse, and they were acquired for a short period by IDW Publishing, which released the canonical series Angel: After the Fall alongside other non-canon titles. Dark Horse reacquired the rights in 2010 and subsequently released the series Angel & Faith and Angel. In 2018, Dark Horse Comics announced that, after 20 years, the license for Buffy and related material would transfer to Boom! Studios. The first issue of the reboot series was released in January 2019.