Alexander Kalugin (original name: Александр Калугин) is the actor who played Major Sergei Vallarin and subsequently the Goa'uld Marduk in the Stargate SG-1 episode "The Tomb".
- In addition to playing Sergei Vallarin, Alexande Kalugin also served as the language coach for British-born actor Garry Chalk (Colonel Chekov).
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