Relatives:
Phillip Summers - Grandfather
Deborah Summers - Grandmother
Christopher Summers/Corsair - Father
Katherine Anne Summers - Mother(deceased)
Scott Summers/Cyclops - Brother
Adam-X/X-Treme - Suspected half-brother
Jean Grey-Summers/Phoenix - Sister-in-law
Madelyne Pryor - Sister-in-law(deceased)/Wife(Mutant X Universe)
Scotty Summers - Son(Mutant X Universe)
Nathan Christopher Summers/Cable - Nephew
Nate Grey/X-Man - Nephew(Age of Apocalypse)
Powers: Havok is a mutant with the superhuman ability to absorb ambient cosmic energy and release it as waves of intense heat creating plasma, a state of matter consisting of charged subatomic particles. Heat waves will emanate from Havok's body in all directions unless purposefully channeled, usually along the length of his arms into a blast.