|Doug "Rat Man" Rattmann|
|Name||Doug "Rat Man" Rattmann|
|Vehicles and/or Gadgets||None|
|Residence||Aperture Science Enrichment Center|
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 schizophrenic, he is dependent on antipsychotic medication as a means of keeping him sane. Rattmann appears in-game in certain areas, he also leaves 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.
- He can be found in some parts of the GLaD to See You level.