What Was The Most Successful Summer Movie?

With Summer 2009 well and truly behind us, it's worth taking a look back and wondering: What movies were the big hits of the season? The answer may depend on how you define "big hit," but here's our guide.

If you're looking for the movie that outright made the most profit? Well, that's Transformers, but only just; right behind it is the movie that offered the best Return on Investment for studios, with some math that could even tempt some studios into spending less money on movies in future... unless Michael Bay is involved, of course. But there's no denying that District 9 has to be some kind of gamechanger for science fiction movies of the future, going by these numbers.

(For the math-inclined, these movies are ranked in terms of ROI.)

[UPDATED to add Wolverine and Harry Potter, because I forgot both. Sorry!]

District 9
Domestic Box Office: $112,440,084 (over 6 weeks - $18,740,014 per week average.)
Budget: $30,000,000
Profit: $82,440,084
(374% return domestically)

Transformers: Revenge Of The Fallen
Domestic Box Office: $401,555,453 (over 13 weeks - $30,888,881 per week average.)
Budget: $200,000,000
Profit: $201,555,453
(200.7% return domestically)

Star Trek
Domestic Box Office: $257,638,255 (over 20 weeks - $12,881,912.75 per week average.)
Budget: $150,000,000
Profit: $107,638,255
(171.76% return domestically)

X-Men Origins: Wolverine
Domestic Box Office: $179,880,256 (over 21 weeks - $8,565,726 per week average)
Budget: $150,000,000
Profit: $29,880,256
(119.92% return domestically)

Harry Potter and The Half-Blood Prince
Domestic Box Office: $299,695,999 (over 10 weeks - $29,996,599 per week average)
Budget: $250,000,000
Profit: $49,695,999
(119.88% return domestically)

Moon
Domestic Box Office: $4,843,670 (over 15 weeks of limited release - $322,911.33 per week average)
Budget: $5,000,000
Profit: -$156,330
(96.87% return domestically)

GI Joe: The Rise of Cobra
Domestic Box Office: $146,569,665 (over 7 weeks - $20,938,523.43 per week average)
Budget: $175,000,000
Profit: -$28,430,335
(83.75% return domestically)

Terminator Salvation
Domestic Box Office: $125,322,469 (over 16 weeks - $7,832,654.31 per week average)
Budget: $200,000,000
Profit: -$74,677,531
(71.61% return domestically)