It's hammer time.

No one could touch 'Thor' at the box office this weekend. The hammer-wielding thunder god debuted at No. 1 with an estimated $66 million, about as much as the rest of the top five combined.

'Thor' didn't open as big as some other Marvel movies, like the first 'Iron Man' ($102 million in 2008). Still, that $66 million was right in line with expectations, with some 60 percent of that generated from 3D and IMAX screenings. Plus, the movie has already earned $176 million overseas. So shed no tears for the earthbound Norse god.