Marvel has given readers pulse-pounding adventures over the years and its heroes protect everything from city blocks to the planet from supervillains and disasters. Teams like the Avengers, the X-Men, the Fantastic Four, and the Defenders have saved the Earth many times from terrible threats. Sometimes, Earthbound villains like Ultron are out to destroy everything; other times beings like Galactus come from the stars with little care at all for Earth or humanity.
Source：https://www.cbr.com/greatest-global-dangers-marvel-comics/
