Need a synopsis: Thor mini-series "Vikings"

My local comic outlet has strange gaps in it’s coverage. It had issue 2 of Vikings, then months later issue 5. All I know of the story:

Issue 2, A band of unkillable, unstoppable Viking marauders come to New York from somewhere. Thor tries to stop them, but their leader beats him to a bloody pulp.

Issue 5, Thor has rounded up three people (presumably by time travel?) who literally worship him: a Norse woman, a Teutonic knight, and a (good, or at least noble) Nazi (!). Somehow with their help, Thor defeats the Vikings and blasts their leader into deep space.

So can anyone fill me in on what the heck happened?

#1

#2