When a series of burglaries occur, all of them involving thefts of Turtle memorabilia, the Turtles investigate. April's apartment gets broken into, but just as the burglar is driving away, she takes down the license plate number on the vehicle. The police give her an address and she and Irma go to investigate. They discover that Monroe Q. Flem, the manufacturer of rare gasses and a billionaire, is a collector of everything and anything having to do with the Turtles. When April and Irma go to the mansion, April goes in,leaving Irma in the van. As soon as she sets foot on the grounds, Flem captures her. Meanwhile, the Turtles get worried when they can't contact April so they go to her apartment. The place is deserted when they get there. After looking around, they discover an address which they assume is the one April got from the license plate. They search for April, thinking that she might be in danger. When they arrive at the mansion, they get captured by Flem when he sprays them with
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