While the two were still in their mother's uterus, they were genetically modified, which gave them bio-energy powers which they can use when in physical contact with one another (usually when holding hands).
[1] The Strucker twins despise Magneto for his role in their father's seeming death some years after World War II.
They conduct acts of terrorism and finally attack Magneto during the trial in Paris by the International Court of Justice for crimes against humanity.
[2] The X-Men foil their assassination attempt, but Fenris manages to escape by allowing themselves to be swept into the old city sewers.
The twins joined a conference of powerful criminal leaders who intended to divide up what's left by the Kingpin's fallen empire.
If he helps kill Songbird, Moonstone would be able to make a move to usurp Norman Osborn, the Thunderbolts' mentally fragile director.
Despite his considerable skill, he has been defeated twice; the first is when Jack Flag hit him with the flat of his own sword and the second is when the Steel Spider threw him through a window and a flat-screen television using a metal limb.
He has gained the loyalty of several guards by paying them well and ordered them to set off a bomb in the Zeus (the Thunderbolts' carrier) to initiate a lockdown.
[6] Soon afterwards, Osborn snaps from the pressures of running the Thunderbolts and the Green Goblin brutally attacks Andreas, crucifying him to a wall with small Goblin-Daggers.
[11] Andreas later confronts Osborn with the revelation that he wasn't offered a slot on the Dark Avengers, as well as never planning on resurrecting his sister or receiving a Presidential pardon; Osborn has a moment of insanity and stabs Andreas through the chest with his own sword, apparently killing him and throwing him out over the mountain.
[13][14] As a result of genetic engineering with their X-Genes when they were still in utero, Fenris are able to fly and generate energy blasts, but only when they are holding hands.
His sword's hilt is wrapped with Andrea's skin to release powerful bioelectric blasts of concussive force.
[17] The Ultimate Marvel version of Andrea von Strucker and Andreas von Strucker are androgynous mutant twins who can generate heat blasts and protective force fields when they touch each other that seek mutant supremacy through economic control as German business tycoons.
As a result of their activities involving the Sentinels and the Mutant Liberation Front, the twins apparently killed during their battle with Bishop's X-Men team.
[19] Fenris appears in The Gifted, with Andreas von Strucker portrayed by Paul Cooper (younger) and Carsten Norgaard (older) and Andrea von Strucker portrayed by Caitlin Mehner (younger) and Julia Farino (older).