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Doug Rattmann, commonly nicknamed as the Rat Man, was a scientist at the Aperture Science Enrichment Center. Prior to the events of Portal while GLaDOS began flooding the entire facility with neurotoxin, Rattmann is the only known employee to have survived. A paranoid, he is dependent on anti-psychotic medication as a means of keeping him sane.

Rattmann does not appear in-game in any form, instead leaving behind paintings and murals which can be found throughout the backstage of various testing chambers in Portal and the single-player campaign of Portal 2.

Portal 2: Lab Rat


In the Portal 2: Lab Rat comic, he is revealed to be an Aperture Science employee who worked on the Handheld Portal Device.

Portal


Delusional, running low on medication and traveling with what he sees to be a talking Weighted Companion Cube, he watches from the shadows as Chell is put through GLaDOS' testing course. Although he is never spotted in-game in any of the playable Portal series, his refuge areas (referred to as dens) can be found by Chell, containing crude bedding, empty cans of beans and scribblings and dioramas on the walls. It is in one of these dens that the warning phrase "The cake is a lie" can be found scribbled on a wall; as GLaDOS continually promises that there would be cake at the end of testing.

Portal 2
During the events of the single-player campaign of Portal 2, Rattmann's fate is left unknown. Whether or not he is dead is left up to debate, as Chell's cryogenic stasis bed that she used before the events of Portal he took refuge in, had disappeared entirely.



All that is left of him in Portal 2, like in the first game, are wall scribblings and various dioramas depicting either what he witnessed or simply what he feels like expressing.

Rattmann's graffiti work makes no appearances whatsoever during the course of the game's Cooperative Testing Initiative.

Known dens
Aside from leaving paintings, murals and messages behind, Doug Rattman also discovered a number hidden rooms in Aperture Science. He adorned these rooms with messages and artwork, and primarily used them as refuges in order to escape GLaDOS' scrutiny. The hidden rooms are present in both Portal and Portal 2, and are known as the Ratman's Dens. A total of 12 have been discovered, 5 in Portal and 7 in Portal 2.

Trivia

 * Doug Rattmann was behind the Aperture Image Format, used in the Portal ARG.
 * He can be [[Media:Doug_Rattmann_Sp_a2_pull_the_rug_r2.ogg|heard rambling]] in certain locations of his dens in Portal 2.
 * His voice also can be heard in Portal 2 OST during track "Ghost of Rattman"
 * In both of the above situations, his voice actor is unknown.