Sectoid Commanders are powerful psionic enemies in XCOM: Enemy Unknown. They pose a serious threat to XCOM due to their devastating psionic attacks. They can be found alone or in small groups and use cover and flanking tactics.
Although they look similar to their weaker brethren, Sectoid commanders have larger heads covered in thick veins, and glowing red eyes. Like Sectoids, they are all genetically identical clones, but have been engineered with greater endurance and incredible psionic powers. While these gifts make them far more deadly than the lower caste front line troops they command, they are still ultimately little more than subservient pawns of the Ethereals.
The Sectoid Commander first appears during the tutorial mission in Germany in which it uses Mind Control to force a German soldier to attack the XCOM Assault team. The Sectoid Commander is first encountered in combat during the assault on the Alien Base. After this point, Sectoid Commanders appear on the bridge of alien UFOs, replacing the Outsider. They may appear individually or in small groups. After the Overseer Crash Site mission is complete, they are replaced by Ethereals.
Due to their high defense and use of cover, Sectoid Commanders can be hard to hit. Try using Snipers or flanking tactics to compensate for this.
Mind Control is by far their most dangerous ability. If one of your squad gets mind controlled, consider using the Sniper's Disabling Shot or Suppression on them to buy yourself more time to kill it and free your squadmate from its control.
If all else fails, explosives such as Alien Grenades and Rockets are extremely effective against Sectoid Commanders as they ignore cover and defense.