In this new XCOM: Enemy Within trailer from 2K and Firaxis Games, deadly new enemy units have been deployed to the battlefield, yet a newly discovered alien substance
brings the opportunity to augment your soldiers with biological or cybernetic enhancements. These soldiers sacrifice much, but gain never before discovered combat effectiveness. It’s your decision, Commander.

This trailer includes the first footage of the Seeker, the second new alien that will be included in XCOM: Enemy Within.