This procedure must be repeated enough times until the Gene Worm finally dies. The heart is its weak point and must be attacked with the lasers to damage it. Once it is completely blinded, the creature will expose its heart and create a portal that will summon an enemy. It will attack players with its toxic breath and will lash out with its tentacles, but it can be temporarily blinded using the mounted laser guns on either side of the portal.
It invades an abandoned sector in the Black Mesa facility through a dimensional portal, and players must work together to kill the creature before it fully emerges from it. It strongly resembles the Xen Tentacle in both its color and its beak-like protrusions, meaning that the two must be related. The Gene Worm is a large, tentacled alien life-form that serves as the final boss for the Opposing Force campaign.
