Randy Quaid -- My Bank Stole My Fortune

8/23/2010 8:30 PM PDT

Randy Quaid -- My Bank Stole My Fortune

Randy Quaid claims his most trusted financial advisors -- along with his bank -- conspired in a diabolical plot to steal his multi-million dollar fortune ... this according to a new lawsuit.

Acting as his own attorney, Quaid filed a lawsuit in L.A. County Superior Court today, claiming he's lost more than $10 million in "loans I did not need or want" after his advisors forged his signature on key financial documents.

Long story short -- Quaid claims the advisors made fraudulent real estate loans with the help of City National Bank ... which has led to huge financial losses and big trouble with the I.R.S.

Quaid also claims his financial people stole several paychecks from his work on high profile Hollywood projects -- specifically an estimated $600,000 in royalty checks for his role in "Brokeback Mountain."

In the suit, Quaid does not specify how much he wants from the advisors and the bank -- but he implies that the number is astronomical.