 The episodes featured the return of several recurring characters , as well as stunt casting in the form of appearances by Golden Brooks , Joe Maruzzo and Steve Schirripa . These were the first episodes of the franchise to be shot on digitally rather than using film stock , and the filming of the two halves were completed together over 14 days . The first part was seen by 2 @.@ 84 million viewers , increasing to 3 @.@ 11 for the second episode . " Storm Front " was poorly received by the critics , with complaints directed at the pace of the episode , the ending of the Temporal Cold War and the general premise itself . 
