Doug Rattman is a reoccurring unseen character in the Portal game series, as well as the protagonist of the Portal 2 tie-in comic, Lab Ratt. He is the focus of the first episode of Season 2, when Mullet Mike reviews the game Portal 2 and tries to decipher an audio file believed to be Doug Rattman's voice.

During the first episode of Season 4, Mullet Mike reveals that Doug Rattman moved into his attic, where he remains until the pilot of Season 7.

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