Thanos later discovers via an oracle a new extraterrestrial threat - Tyrant (comics), a failed creation of Galactus.

Its purpose is to deal with extraterrestrial threats to world security.

Millions are dead, and the world's nations agree to work together to combat this new "extraterrestrial threat".

Steve Bronson was able to alert the military to the alien Sandman's presence, but they also proved ineffective in dealing with the extraterrestrial threat.

Called on to protect the planet from extraterrestrial threats using Rann's technology, Strange grew to care for the planet and its inhabitants, especially Alanna.

Its prime directive is to defend Earth against extraterrestrial threats.

In order to defend humanity from extraterrestrial threats, the government begins to research and develop humanoid mecha called Personal Troopers.

"President Grozny, are you questioning whether this extraterrestrial threat exists?"

Operating under the auspices of the United Nations, its purpose is to investigate and combat paranormal and extraterrestrial threats to the Earth.

In the not-too-distant future, the Earth finds itself constantly under attack from extraterrestrial threats.