The Global Guardians
They first came together in late 1977, to defeat an alien villain called Grax (an old Superman foe). Grax had planted bombs on Earth's seven continents to destroy it. Thanks to a warning from the Wonder Twins the SuperFriends discovered the plan in time and recruited the heroes of the countries affected to find the bombs before they exploded.
It wasn't until 1982 that they were introduced as the team known as Global Guardians, in which they helped Superman stop an evil sorcerer.