Alien robots have transformed into box-office superstars with $200 million in ticket sales domestically in just five days.

"Transformers: Revenge of the Fallen" has taken in $112 million domestically in the sequel's first weekend and $201.2 million since opening Wednesday. For the first five days, that puts the "Transformers" sequel second only to last summer's "The Dark Knight" with $203.8 million.

This was the biggest opening weekend of the year, surpassing the $85.1 million debut of "X-Men Origins: Wolverine" in early May.

The sequel began with $60.6 million in its opening day Wednesday. That also was second only to "The Dark Knight," which had the biggest box-office day ever with $67.2 million on opening day.

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