Over the long evolution from Betamax to VHS to LaserDisc to DVD to HD-DVD to Blu-Ray to 4K, there have been multiple opportunities to purchase films multiple times in a variety of formats. And that's not even counting special edition re-releases in the same format and other stuff like that. Which films have you bought the most often? I have 2 movies tied at 5 copies a piece: Star Trek: The Motion Picture. I started with the regular theatrical cut on VHS. Then a VHS copy of the Director's Edition when it first came out in 2001. Then I eventually upgraded to the 2-disc Director's Edition DVD. Then I got the 2009 DVD box set with a bunch of new bonus features. Then I upgraded to the Blu-Ray box set last year. Star Trek: First Contact. This one also gets a leg up because I bought it twice on VHS, first in fullscreen, then in widescreen. Then I followed the same pattern with the 2-disc Special Collector's Edition, the 2009 DVD box set, and the Blu-Ray box set. Most of the other Star Trek movies up through Insurrection have appeared in my collection 4 times. I kept upgrading and looking for new bonus features but only bought each of those on VHS once. Eventually, the Back to the Future trilogy will be entering the 4-timers club for me. I already got all 3 on VHS, the 2002 DVD release, the 30th Anniversary set from 2015, and now I'm planning on getting the Ultimate Trilogy when it comes out this October. (I absolutely can't resist the siren song of never-before-seen screen tests. And I'm cautiously optimistic about the upcoming musical.) Beyond that, the only other movies that went through my collection in all 3 major formats (VHS, DVD, Blu-Ray) are Stargate and X-Men. I never owned that many movies on VHS and most of the ones that I did haven't made it past DVD, assuming that I even upgraded them at all, like Ghostbusters 1&2, Alice in Wonderland, Snow White & the Seven Dwarfs, The X-Files, the first 4 Star Wars movies, and the MST3K version of "Mitchell." What about you guys? Which movies have you double, triple, or even quintuple-dipped on?