The Region 1 DVD set, from Rhino Home Video, includes all 16 episodes spread over 3 discs. The fourth disc contains the script to episode #4, bumpers, animation outakes, slates and tests. All episodes have been mastered in Dolby 5.1 Audio.
The NTSC VHS set, also from Rhino Home Video, contains just the 16 episodes spread across 4 tapes.
The Region 2 DVD set, contains all sixteen episodes in 5.1 Audio, plus, two additional episodes (Five Faces Of Darkness, Part 1 & The Rebirth, Part 1). Also included are Character Profiles, Classic Quotes, Fan Art Gallery, Complete Episode Guide, Quiz, Original Scripts, Bumpers and Adverts. (Makes me yearn for a multi-region DVD player, since I live in North America. :-( [sigh] )
The PAL VHS set is not really a set, but 3 separate volumes, which must be purchased separately. The episodes are also not presented in any sort of order that I can tell.