Might have been a TV series, American. The character was a chubby white geek who was working as an operative, or a spy. He might had been 'invisible' or something, because he was able to enter rooms and be so boring that no one noticed him. I think it might have been futuristic / sci fi?
closed as too localized by TylerShads♦ Feb 13 at 13:29
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It reminds me "Get Smart's Bruce and Lloyd: Out of Control". This movie is an spin off of the movie "Get Smart", it involves stealth spies, invisibility and the protagonists are nerds, one of them is chubby.
Frankly, theres not much to go with. But the words american, white geek, spy bring the TV Series Chuck to mind.
There was also some sci-fi involved and though I dont't remember Chuck becoming invisible at any time, he was kinda nondescript and goofy letting him keep a low key.