This ... this movie. Gene Kelly and Olivia Newton John somehow maintain their dignity during this glorious dumpster fire. The plotline is roughly "What if we signed ELO and shoveled a ton of money into a movie that was put in front of the cameras with no script? Let's have four or five different styles of dancers that have no idea what the others are doing, and film them all together with no thought to blocking. And tie it all together with a ham-faced cipher that we're going to make the romantic lead!"
See the film that asks the question, "Can we make Roller Disco cool?" (And that answers it with a resounding "No, we can't. Nobody can. We honestly don't know what got into us)