The five-disc Blu-ray edition of True Blood: The Complete Fourth Season is fleshed out by a wealth of informative and entertainment extras that provide a detailed look at the series' execution from the perspective of creator-executive producer Alan Ball, as well as key members of the cast and crew. Ball is front and center on the majority of the supplemental features, from commentary with Anna Paquin on "If You Love Me, Why Am I Dyin'?" to the 28-minute Final Touches, a postproduction documentary roundtable that explores the central themes and creative requirements of the season. Moyer, Skarsgård, Woll, Shaw, and Sam Trammell, who plays shapeshifter Sam, also contribute to five additional commentary tracks, and a vast number of the show's supporting cast reprise their characters in the Enhanced Viewing mode, which offers both video and text commentary on individual episodes. Much of this is quite amusing and well crafted, though they can only be accessed through the Enhanced Viewing option and not separate from their respective episodes. The little details are also key to the True Blood Lines, a thumbnail encyclopedia of the show's immense cast of characters, organized by their particular species (human, vampire, etc.), that traces how each are connected to the rest of the Bon Temps population. Each episode also gets a brief summation from the show's writers and producers in the Inside the Episode featurettes. A pair of double-sided DVD copies and digital copies rounds out this impressive set. --Paul Gaita