Comment: This video is over 8 minutes long. While the scenes are terrible, they do fill out the story a little bit more. The famous fight scene between Superman and Nuclear Man I is in this video, (Note: but the club scene that happens before this isn't in it). The scene ends up being really goofy. So goofy that Superman actually does a 'time out' sign during the battle!
I can see why they were cut, but they never bothered to at least re-shoot the cut footage so the movie at least would make sense. What we get is a short movie that is very confusing.
This montage of deleted footage isn't all the stuff that was cut from the film after the terrible test screening.
The tornado scene is still missing from most US prints and Lex Luthor going into hiding is still missing, as well as some other subplots.
Here's a bit of Entertainment Tonight's making of Superman IV.
While most of this stuff is fluff, it does give a little insight into why Christopher Reeves came back to film Superman IV, considering that he hated doing Superman III.