Shrew formerly worked as one of Hell's Belles, trained by Cyber, and employed by a drug cartel. Tiring of this existence, perhaps after being arrested, she turned in evidence against her old allies in exchange for being given immunity from criminal trial. She was to enter the witness protection program after her testimony, but when her old allies came after her, the US government commissioned X-Factor to protect her.[1]

While Havok, Strong Guy, and Wolfsbane watched over Shrew at the Barclay Hotel in Virginia, Hell's Belles and Cyber came after her. While X-Factor was occupied against her former teammates, Shrew was left to face Tremolo.[2]

X-Factor managed to temporarily drive off Hell's Belles, but Cyber had poisoned Strong Guy and demanded Shrew in exchange for an antidote.[2] The US government's toxicologist provided his own antidote, and X-Factor and the Shrew confronted Cyber and the Belles. X-Factor joined by Multiple Man and Quicksilver overpowered their attackers, and Shrew herself gathered the courage to knock Cyber into the path of an oncoming subway train. He survived unfortunately.[3]

It is unknown if Shrew lost or kept her mutant powers after the M-Day.


Transformation: Marilyn is able to transmorph her body into a large soricidae with anthropomorphic attributes, which gives her:

  • Heightened Strength
  • Superhuman Speed
  • Superhuman Agility
  • Superhuman Endurance
  • Superhuman Reflexes
  • Hyper-Keen Superhuman Senses
  • Razor Sharp Talons

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