I'm aware of the anime Metropolis, yeah, and it's been on the "wanna see" list for a while. But thank you for mentioning it! : )
No prob. If you want a little preview, check out this homemade music video set to Styx's 'Mr. Roboto'️ ↗, comprised entirely of clips from the film. :-)
I'm mostly curious about this! Going by the title, I was thinking it was more of a direct adaptation. (Sorry, didn't read too much on wiki because didn't I wanna spoil anything serious.) I have the Fritz Lang flick on DVD (five buck bin, FTW!) like any self-respecting nerdroid should. ; ) I also see they've got it full length on youtube. Yes, I was looking for the cartoon...heh...
If you have any of the Encore cable channels, they have been showing the film occasionally. That's where I saw it/recorded it from.