By Dean Murray

A comic found in an attic could become the most valuable ever.

A pristine copy of the first Superman comic could fetch over $6 million after three brothers found it stored in their late mother’s home.

The incredible find also unearthed five valuable early copies of Action Comics, the publication that introduced Superman to the world in its premiere issue.

Dallas-based Heritage Auctions said: "Three Northern California brothers taking stock of their late mother’s belongings in their family home during the holiday season last year discovered she had for decades held onto a cache of old comic books, tucked away in an attic beneath layers of brittle, faded newspapers and cobwebs.

"Six treasured comics, kept since she and her brother bought them between the Great Depre

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