As with the First Series set, the supplemental features are plentiful here; commentary by the show's cast and crew is provided on each episode, and four feature picture-in-picture commentary tracks; deleted scenes and outtakes are also included, as are video diaries by Tennant and Piper, and a lengthy featurette, "Doctor Who Confidential," which covers nearly every aspect of the series' production, including the introduction of the Torchwood Institute and the return of Sarah Jane, both of which would be featured in their own respective spin-off series (the first in Doctor Who's long history) in 2007. – Paul Gaita