Lieutenant Colonel Sergei Evanov was the commanding officer of SG-4, the first regular Russian SG team at the SGC. He and his team joined SG-1 on the mission to P3X-367 where they were captured by Nirrti. Colonel Evanov was subjected to Nirrti's DNA resequencer and the resulting genetic manipulation caused all of his cells to break down and his body to dissolve into liquid.
Portrayed by: Raoul Ganeev
Episode Reference: Metamorphosis