Gorgo (1961) and Gappa (1967)

 I was working on a poster for Gorgo for fun and after rewatching the film I realized I had seen something else really similar.

Gorgo is the giant monster story of mercenaries finding a treasure and a giant monster who turns out to be a baby with parent that comes to find it after it has been put in a sideshow in London. The two main characters also just sort of kidnap/save a young Irish kid. Doing so saves his life but it still seemed sort of sketchy. In the end the monsters return to the sea from which they came. The effects are pretty good thought monster is sort of goofy looking. The giant props work well and there is enough monster on major city destruction to satisfy kaju fans. 

Gappa, goes by a few names but has a similar story. The detail are different and follow well established Japanese monster tropes closer than they follow the plot of Gorgo. This time an egg hatches as adventurers are looking for animals to exhibit in a theme park. they take it back but pretty soon its parents are flying to Japan looking for it and no building will stop stop them. In the end they all fly off, back to island they came from, one assumes. Though nothing amazing, it's not a bad giant mosnter flick with the sort of effects expected for a 60s Japanese film.