An Italian-dubbed version is on YouTube (subtitles hardly needed). The producers obviously decided to go all-out for the start of season 3. Putting aside the roller disco scene, the featured guest stars on the two-parter are 1970s-amazing too: Jim Brown, Bill Daily, Leif Garrett, Ed McMahon, Larry Linville, and the late great Larry Storch.
Watching that first scene is a reminder of how much filler was in the shows and movies of the time. Lots of repetitive action-free shots of people just travelling to get from point A to B.