DC Hall of Justice Wiki

The first DVD, as customary with other first episode DVDs is titled as if a standalone feature.

Justice League is the title of the first ever video feature from the Justice League/Justice League Unlimited series. The entire video is a repackaged form of "Secret Origins" dropping the repeated opening and ending credits, treating three episodes as one full-length feature.

All episodes released that followed kept the original two/three part aspect, except for Justice League:Starcrossed, The Movie, which repackaged all three episodes of Starcrossed into a film, much like Secret Origins. Starcrossed goes even further by changing up the opening credits for a new 'film' feel.