Hellions

There have been several groups of fictional characters in the Marvel Comics universe who have been known as the Hellions. These groups were rivals of various teams of younger mutant heroes in the X-Men franchise.

The first and most notable incarnation of the Hellions were students of Emma Frost and the Hellfire Club's Massachusetts Academy, and were rivals of the New Mutants. Years later, another group of Frost's students, this time at the Xavier Institute, would name themselves "the Hellions"; they too would be rivals of a group calling themselves "the New Mutants".

Read more about Hellions:  Hellions (Massachusetts Academy), Emplate's Hellions, The New Hellions, Hellions (Xavier Institute)