Highlander: There Should Have Been Only One.
Highlander 2 was a troubled film. It had two showstoppers in particular.
Firstly, the country they’d chosen to film it in (Argentina, IIRC?) suffered a massive economic crash which knackered up a lot of their filming. Secondly, the studio kept interfering and imposing stupid changes.
The director’s on record as being, ah, ‘slightly dischuffed’ about the whole thing. He’s tried a couple of times to fix it as best he can, with post production / re-editing / cutting-room floor material.
I’ve got a VHS copy of the “Renegade Edition” which does at least make the film vaguely coherent (and does away with all the nonsensical ‘aliens from the planet Zeist’ story). It’s been further fiddled with since then too, there’s a DVD special edition / director’s cut / ultimate version or some such which is a bit more fixed, I believe. I’ve not seen that yet though.
But yeah, the theatrical release of Highlander 2 is right up there on my “crushing disappointments in cinema” list, just above Escape From LA.