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.
Vin Diesel and the Rock may be weeping a little, however, since 'Fast Five' took the biggest pounding from 'Thor.' After opening at No. 1 a week ago, it dropped a drastic 63 percent of last week's business and fell to second place. Then again, a weekend take estimated at $32.5 million is nothing to cry about. Nor is a ten-day total of $139.9 million.

Vying for third place this Mother's Day weekend were wedding-themed comedies 'Jumping the Broom' and 'Something Borrowed.' At press time, 'Jumping' had a slight edge, though that could change when final numbers are released Monday. Its estimated $13.7 million (compared to $13.2 million for 'Borrowed') is especially impressive, considering that it opened on 869 fewer theaters than 'Borrowed,' and that it's competing for the same predominantly African-American audience as 'Tyler Perry's Madea's Big Happy Family,' still in the top 10. 'Jumping,' however had decent reviews, while few critics liked 'Borrowed.' So 'Jumping,' with a reported budget of $6.6 million, is already a hit, while 'Borrowed,' which cost a reported $35 million, will have trouble making back its budget.

Rounding out the top five was 'Rio,' still the top choice for families with young children. It earned an estimated $8.2 million, a decline of 45 percent from last week. Its four-week total is $114.9 million.

'Thor' - Trailer No. 3

The full top 10:
1. 'Thor,' $66.0 million (3,955 screens), new release
2. 'Fast Five,' $32.5 million (3,662), $139.9 million total
3. 'Jumping the Broom,' $13.7 million (2,035), new release
4. 'Something Borrowed,' $13.2 million (2,904), new release
5. 'Rio,' $8.2 million (3,258), $114.9 million
6. 'Water for Elephants,' $5.6 million (2,614), $41.6 million
7. 'Tyler Perry's Madea's Big Happy Family,' $3.9 million (1,881), $46.8 million
8. 'Prom,' $2.4 million (2,730), $7.8 million
9. 'Soul Surfer,' $2.1 million (1,781), $36.7 million
10. 'Hoowinked Too! Hood vs. Evil,' $1.9 million (2,505), $6.7 million

Follow Gary Susman on Twitter @garysusman.
Something Borrowed
Based on 30 critics

A tipsy attorney (Ginnifer Goodwin) lands in bed with the fiance of her best friend (Kate Hudson). Read More

Based on 40 critics

After his reckless actions reignite an ancient war, the Norse god is banished to Earth. Read More

Jumping The Broom
Based on 26 critics

Worlds collide when two diverse families attend a wedding on Martha's Vineyard. Read More