The three members of Spinal Tap and the film's director are suing for $400 million which they say media companies Vivendi and StudioCanal denied them.
The 1984 faux-documentary about a fake heavy metal band dealing with a career in decline has become a cult classic among rock fans and performers of all genres.
Stars Christopher Guest, Michael McKean and director Rob Reiner have joined an earlier suit filed by Harry Shearer, according to Hollywood Reporter.
Shearer's original lawsuit claimed $125 million in damages, but as his partners joined, the sum was raised to $400 million.
The four say they were given only $81 in merchandising income and $98 in music sales over the past 33 years. They also claim they've never received accounting statements for the film This Is Spinal Tap.
The lawsuit claims a 1982 agreement entitles the four creatives to 40 percent of net receipts.
"What makes this case so egregious is the prolonged and deliberate concealment of profit and the purposeful manipulation of revenue..." Reiner said in a statement.
Photo: Getty Images