Star Trek: The Next Generation - Regeneration: Engaging the Borg (2013)

This documentary aired with The Best of Both Worlds theatrical event. I have not been able to confirm if it is included with the Blu-Ray/DVD/Digital Copy. The Best of Both Worlds was the two part Next Generation story consisting of the season 3 finale and the season 4 premier. This doc looks at how the main villain, the Borg, was designed. And many of the cast and crew members are interviewed about their work on these episodes. During the summer break, between seasons, several cast members weren't sure if their contracts would be renewed. It was a cliffhanger like "Who killed J.R.?." We also see how some of the special effects were accomplished.