UPDATED: A rare Superman comic book has sold for $3.2 million -- the highest price ever paid for a comic book.
The auction began at $1 million on Aug. 14, according to AZ Central. It doubled to $2 million four days later. The last day of the auction was Sunday. It has not been revealed who bought the comic.
Superman's debut comic book sold for 10 cents in 1938, but now it could be worth millions.
A "pristine" copy of Action Comics #1 will be auctioned off on eBay in August, and it is expected to sell for big, big bucks.
The comic book is one of only 50 to 100 in existence and it has been given a grade of 9.0, which means "very fine" in the collectible world.
According to an expert with the Certified Guaranty Company, the comic book is supple, the colors and deep and rich, and the quality of the white pages are amazing.
A less well-preserved copy of the comic sold in 2011 for $2.1 million.
According to Time, the owner, Darren Adams, got the copy from a dealer and originally stored it in a cedar chest in West Virginia. He then placed it into a bank vault.
The auction is scheduled to take place Aug. 14 to 24.
A portion of the proceeds will go to the Christopher & Dana Reeve Foundation. Reeve was known for his role as Superman in the iconic 1978 movie. He became a quadriplegic in the 1990s after being thrown from a horse. He died in 2004.
The auction is taking place as anticipation builds for the latest movie "Superman vs. Batman: Dawn of Justice," starring Henry Cavill and Ben Affleck. The movie will hit theaters on May 6, 2016.