Businesspersons, brainwashed by Shredder, at the Octopus Stadium
The Octopus Stadium is a stadium at Octopus Inc. It appears in the Corporate Raiders from Dimension X episode of the 1987 animated TV series.
The stadium was built to celebrate the anniversary of the company being founded 100 years earlier. Shredder gathered the brainwashed businessmen at the stadium in time for the Technodrome arriving, but the turtles instead cause the sprinklers to spray water at them, breaking the brainwash.