Sounding more like a song by Judas Priest than a card set, Fleer's Metal Universe was one set I never collected upon its release. Perhaps that's because I've never been a comic book reader/collector. I will give the company credit, though: it was a very unique set.
And while I still don't have an interest in the base set, the same can't be said of the insert sets.
1999 Planet Metal #4 Chipper Jones
These interesting die-cut cards were inserted 1:36 packs and featured fifteen of the games best players.
1999 Boyz with the Wood #10 Chipper Jones
When I ordered this one, I didn't realize the cards in this insert set were folded. At first sight, I thought the card was a victim of an xacto-knife.
2000 Hit Machines #10 Chipper Jones