You're better off just watching Part 4 the anime. This is literally just a compilation of like three or four episodes from the show, Jerry rigged to be one story. To be honest, it's done pretty well, and the new bits that they add to this to make it all one cohesive plot for a film is pretty effective. But you're better off just watching the show, I imagine that if you've never seen the show and you wanna watch this to get a taste of what it's like without committing to the whole thing this is good for that... But nothing else really.
Really thought I was gonna get some new part 4 contact out of this one, so it's very disappointing to realize this is what it is.