While Arnold goes out to bring Grandpa his golden watch back from the store, he sees a gigantic hole being dug for new sewer pipes at a construction site. As he looks down it, the watch falls out of his pocket and into the sewer. Now, Arnold and Gerald must go down there to retrieve it, only to find that it's in possession of the Sewer King.
Arnold accidentally drops his Grandpa's watch into a manhole, and goes in it to get the watch back. There he and Gerald meet the Sewer King, who wants to keep the watch as his "royal icon". After going through the trouble of retrieving the watch (using games of chess) and evading capture by a vengeful Sewer King, Arnold gets the watch back to Grandpa, only for Grandpa to accidentally drop it down the drain. The Sewer King, depressed at the loss of his "royal icon" is pleasantly surprised to have it land in his hands, while Arnold is dejected to learn that Grandpa keeps a drawer full of spare watches just in case one gets lost.
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