While the Frost Sisters work for the Hellfire Club, when they introduce their posh base of operations to the Mutant Underground, they claim it was set up by the Brotherhood of Mutants. It is as-yet unclear if they were lying, or if the Brotherood was working with the Hellfire Club. See more
Listen, I get you trying to help, but you're not even a mutant.
I am. And my children are. And the Underground saved our lives. If the Sentinel Services comes after another family, we owe it to them to be there.
I'm sorry, but the fact is since your family came, half our stations have been destroyed.
You can't blame us for that. The Hound program was coming one way or another.
[over everyone's murmurs
Okay. Hey! The X-Men didn't do this 'cause they thought it would be easy. They knew it would ...