AP

A copy of the first comic to feature Superman has sold for US$2.16 million (£1.4 million) - becoming the world's most expensive comic!

AP

The comic cost 10 US cents when it was published in 1938

The issue of Action Comics No. 1 was auctioned online, with a starting bid of just US$1.

Only about 100 copies are thought to exist, with just a few of them still in good condition.

The seller was not revealed, but there are rumours that the comic was owned by Hollywood actor Nicolas Cage.

It's the first time a comic has been sold for more than US$2 million.

It had a reserve price of US$900,000 - that's the lowest amount someone is willing to sell their item for.

The buyer's identity is unknown.

This sale breaks the previous record of US$1.5 million, set by another copy of the same comic - but it wasn't in as good a condition as this one.