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|location= Nomadic
|occupation= [[Shamanism|Shaman]]
|episodes= [[14.07 Unhuman Nature]]<br>[[15.07 Last Call]]
}}
{{Quotation
After administering the grace to Jack to no avail, Castiel places a call to Sergei demanding his help, as Jack's condition has worsened. A disinterested Sergei explains that science is "trial and error." As Castiel threatens to find him if Jack dies, Sergei simply chuckles and dares him to try.
===[[15.07 Last Call]]===
[[Category:Canon]][[Category:Characters]]
