All totals are U.S. box office only. SF and genre-related films in bold.

Title (Dist)….Reported Weekend Box Office….# of Engagements….Cumulative

1. The Dark Knight (Warner Bros.)….$42,664,219….4,266….$393,751,065

2. The Mummy: Tomb Of The Dragon Emperor (Universal)….$40,457,770….3,760….$40,457,770

3. Step Brothers (Sony)….$16,506,526….3,094….$63,172,026

4. Mamma Mia! (Universal)….$12,615,515….3,062….$87,470,125

5. Journey To The Center Of The Earth (Warner Bros.)….$6,662,406….2,285….$72,927,314

6. Swing Vote (Disney)….$6,230,669….2,213….$6,230,669

7. Hancock (Sony)….$5,087,756….2,782….$215,883,222

8. WALL-E (Disney)….$4,603,179….2,555….$204,078,076

9. The X-Files: I Want to Believe (20th Century Fox)….$3,385,878…3,185….$17,021,373

10. Space Chimps (20th Century Fox)….$2,720,177….2,134…$21,971,016

Data provided by Rentrak