Olga Sevenson, aka. Mitra, is the primary antagonist of "Mitra Girl" (Submachine Gun Girl), the twelfth issue of the 1970 Italian adult crime comic "Genius". She was created by artist Milo Manara.
The story beings with Olga, disguised as her villainous alter-ego "Mitra", robbing a bank with two of her henchmen. She accomplishes this with a special device dubbed "the vibrator" which paralyzes all who are inside the bank, while a special substance on the heels and soles of the shoes makes she and her accomplices immune from the effect. After obtaining the money, Mitra murders the people inside the bank using her submachine gun and then does the same to the approaching police in order to steal the vehicle and escape.
Protagonist Lon Flag is curious not only of how the villains are able to pull off the crime without trouble each time, but also how they happen to know precisely when the bank has full funds. His partner, Myrna, goes to investigate one night, but is quickly captured by Mitra's men. The villainess attempts to seduce and molest the heroine, but when her advances are rejected, she has her brought down to the dungeon to be tortured. Mitra follows up by whipping her henchmen after overhearing them joke about how she must not have gotten her way. When one of the men dies from this abuse, the dungeon master protests, only for himself to then receive her lashes.
Afterwards, Mitra has the dungeon master brought upstairs to service her sexually and sends a grotesque man named Corno (Horn) down to kill Myrna. The heroine manages to escape, however, and returns to tell Lon everything that happened. Myrna decides to discuss the matter with Olga, who also happens to work at the F.B.I. there with her as a senior agent. Noticing the heroine's wounds, Olga immediately moves to rub a special ointment on them, before an uncomfortable Myrna backs off.
Some time later, Myrna receives a phone call at her F.B.I. office from a person asking to speak to Olga. When she refuses, the mystery caller tells her to come to a specific address if she wants some valuable information. Myrna does this, but then falls into a trap laid by Mitra. After a second rejection, the villainess calls for one of her muscular minions and orders him to throw the heroine into a nearby aquarium swimming with barracudas. Myra quickly turns the tables, however, and tosses him in instead. As the man is eaten alive, Mitra remarks that it is quite fascinating to witness.
Lon Flag appears as the titular ant-hero, Genius, and chases after Mitra, but she ultimately manages to outwit him by pretending to drown in a lake not too far away. Nevertheless, he has a suspicion that the robbery attempts may not be coming to an end and notifies the police to discreetly secure the next likely target. Sure enough, "Mitra" shows up once again, only to be incapacitated by Olga. When the criminal is unmasked, however, Lon is shocked to find that the woman beneath is in fact Myrna. Later that night, Olga comes to pay him a visit and that is when the hero decides to act on another hunch. He pretends to be enamored with the woman and does not let up until she finally admits that she has also been attracted to him for the longest time, and proceeds to undress. The evil woman is then stunned when Lon leaves for a moment and then returns as Genius. He says he was able to figure it out by getting her to reveal a certain tattoo on her breast; the very same tattoo he had spotted on Mitra the preceding night. He adds that he analyzed the ointment - which Myrna still had on her after the aquarium incident - and determined that it was capable of completely removing the free-will of the person it was applied to.
Seeing that her scheme has come crashing down, Olga attempts to run, but falls out the window and is fatally impaled on the fence spikes below.
