I'm trying to find out the name of a comic book I read as a kid, probably in the 80s.
The story was about an astronaut who is caught in a jupiter storm and is transported to another time. It meets a very technologically backward population (similar to barbarians) and in this region there is a giant wall. On the other side of this wall there is a vast ocean.
I remember that there was at least a second book with the continuation of the story.
The book was in Portuguese but I think it must have existed in other countries.
Can someone help me identify the book? Thanks.