Thanks to my friend Rainer Engel (yes, the comic artist!), I recently got my fingers on a complete set of Sungold's Monster. I'm superexcited, since I've been after these dudes for quite a while now.
Monster is a Universal Monsters bootleg line, and was assumingly released in the early or mid 90s. There's no year shown on the cardback. But the design of the figures and the artwork look totally 90s to me, and at some points remind me of the Toxic Crusaders action figures by Playmates.