Tollin/Robbins Productions - operated by Mike Tollin and Brian Robbins - was behind the CW superhero drama, which aired from 2001 to 2011.
The company has filed a lawsuit against Warner Bros, with their latest allegation being that Warners cost them more than $13.4 million (£8.4 million) by including its sister company DC Comics into the show's 'profit pool' without their knowledge.
The plaintiffs claim that DC is not a "third party" but rather a wholly-owned subsidiary of Warners, saying in a statement: "WBE is in effect paying itself for the Superman rights and then reducing Tollin/Robbins' profit participation by that payment to itself."
The suit accuses Warners of an "egregious act of self-dealing", according to The Hollywood Reporter.
However, Warner Bros maintains that the defendants had known about this arrangement for nine years.
A trial date is currently set for October 9, 2012.
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