Special features include audio commentaries, deleted scenes, webisodes, and several featurettes. In addition to the regular episodes, NBC produced a series of webisodes. The series consisted of 16 TV episodes and 7 webisodes. Referred to as "webisodes", episodes are available via both the BBC iPlayer and YouTube. Kiefer Sutherland has portrayed Jack Bauer in these episodes, including the "prequels" and the "webisodes". Puss is present in DreamWorksTVs vlog-style short webisodes. The first of five webisodes premiered on July 9. However, characters from the webisodes have appeared in the television series. David describes "Head Cases" as a 75-minute movie divided into 5-minute webisodes. The band released a series of webisodes produced by DC3 Music Group detailing their tour. The webisodes parody events that happen on the main show "Community". Captain Kirk has been portrayed in numerous films, books, comics, webisodes, and video games. "The Summer of Love" is a series of four short webisodes. Each visual effect produced in the original webisodes was remastered. Series 4 was preceded by five webisodes that partially bridge the year that has passed.