Gorgo

Yes, Yes, I know...this movie could be viewed as simply a ripoff of Godzilla. But really, the Brits took the concept and did a "Good show, old chap." Unlike most of the 'Zilla movies, it actually has an interesting plot. It's theme has a decidedly "pro environment" message...and the guy in the monster suit doesn't camp it up, but makes the monster seem remarkably real. Now there are some weaknesses...despite a journeyman cast of capable folks, many still turn in one-note performances, as if they're a little embarrassed about being in a monster movie. Also, some of the plot mechanisms are a little creaky. For all that, though, this is a monster movie that's at least a small cut above most. It held my attention as an adult (I'd first seen it as a child and didn't see it again for twenty years), the special effects are mostly quite good, and the ending, despite being hokey, still works! It rarely shows up on tv for some reason...so if you get a chance, rent it (there are copies available in independent shops that specialize in rare movies.)