For the Caltech third floor janitor and former Soviet physicist, see Dmitri.
Dimitri Rezinov (: Дмитрий Резинов) is a and member of Expedition 31 to the International Space Station, alongside Howard "Froot Loops" Wolowitz () and Mike "Mass" Massimino. He appeared inside the in a and in the International Space Station; he has an easygoing preceding of their and finds in Howard. Amidst systems checks, Dimitri questions if the origin of Howard's nickname is because of his . He is less accepting of the actual being that Wolowitz lives with his mom and she makes him . Dimitri also inquires whether Howard and "Mrs. Froot Loops" had a big , when Massimino informs him that Wolowitz just a . As told to Mike Massimino, Rezinov asserted to his own if she gets a or not, he's not going to deal with the of for the , but Massimino assures him he is going to wind up walking the dog. He agrees and assumes the dog will be a — revealing such during his mockery of Howard's uneasiness regarding their nonchalance. While Dimitri is speaking to in Russian, a fretful Howard happens to overhear a , so Rezinov says nine out of ten times there is no problem with this occurrence. Meanwhile, Dimitri and Mike delight at , while Howard is terrified. ("The Countdown Reflection")
The Russian cosmonaut lurks around every bend on the . Still referring to Howard as "Froot Loops," Dimitri pokes his head in to further take Howard aback while Wolowitz fears both against his and displeasing his new wife with their living arrangements. He refers to Mrs. Wolowitz as a woman who says she’s Howard's mother but sounds like his as well as to himself that Howard is just putting himself in a bind and that it is unbelievable s won the . Dimitri tells Howard, after his back-and-forth on and }, "Loops, you realize you just your ass off to your wife and your mother," and what he will do when he gets back to . ("The Date Night Variable")
- Dimitri is most likely the Soyuz Commander as he sat in the Soyuz's center seat.