Acastus Kolya

Acastus Kolya is a Genii military leader and an enemy of the Atlantis Expedition. During the storm season on Atlantica, Chief Cowen ordered Kolya to take Atlantis to accuire C-4. Kolya adivsed against it, as his unit was not yet a strike force, but carried out Cowen's orders. Major John Sheppard was able to thwart his efforts, taking out an entire company by activating the shield sorrounding the Stargate. Kolya finally decided to withdraw, planning to take Elizabeth Weir and Rodney McKay with them, but Sheppard and Aiden Ford were able to rescue them, and Kolya was shot in the shoulder by Sheppard.

The failure of the Atlantis raid forced Kolya from Cowen's inner circle. He later attempted to prevent Atlantis 1 from recovering a ZPM, but was thwarted in the process.

Because of Cowen's growing ambitions, Kolya began plotting a coup. He took Ladon Radim, Cowen's chief scientist and a student of Kolya's, into his confidence, but Ladon betrayed Kolya, forcing him to go underground. Kolya later captured Sheppard, and held him for ransom: If the Atlantis expedition didn't turn Radim over to him, Kolya would allow a Captive Wraith to feed on Sheppard. Sheppard and the Wraith were able to escape, but Kolya was able to flee as well. Sheppard gave him fair warning: If he ever saw Kolya again, he would shoot him on sight.

Koyla later encountered Sheppard and his team when a group of mercenaries called him and his men in having grown sick of Lucius Lavin. He captured the entire team except Sheppard who escaped with the help of Lucius. This time he wanted Atlantis to supply him with guns for a coup having lowered his demand level to something more reasonable and threatened the life of the team if Sheppard didn't surrender. Sheppard eventually surrendered and Koyla ordered him shot to death but Sheppard survived due to wearing Lucius' Ancient personal shield. Unfortunatly it was depleted but Koyla's men were surronded by the villagers and captured. Sheppard offered Koyla the chance to surrender but Koyla just chuckled. The two went for their guns in an impromptu duel but Sheppard was a faster draw and shot Koyla in the heart, killing him instantly fullfilling his promise of killing him the next time they met.