The Volume 4 DVD box set was released in Region 1 on April 28, 2009, Region 2 on April 20, 2009, and Region 4 on November 18, 2009. Six of the 21 episodes are included in the Volume 4 DVD box set. The remaining fourteen episodes of the season were released on the Volume 5 DVD box set, released in Region 1 on June 15, 2010, Region 2 on June 14, 2010, and Region 4 on November 3, 2010.
