A massage therapist has claimed in a lawsuit that 95-year-old Stan Lee rubbed his bare genitals on her foot during a session.

Maria Carballo filed the $50,000 civil suit on Monday in Chicago, claiming the incident took place during two sessions in April 2017 at the McCormick Place Hyatt Recency hotel.

Carballo also filed a criminal complaint against Stanley Lieber, Lee's real name, in Chicago last month, the Chicago Tribune reported.

Lee, through his attorney, has denied the allegations and vowed to fight the lawsuit.

Stan Lee is seen at C2E2 in Chicago in April of 2017. A massage therapist claims he behaved inappropriately during a session while on the trip, which Lee denies

The allegations stem from Lee's visit to Chicago for C2E2, an annual comic book expo.

Carballo's complaint says she was working as an independent contractor for Therapy Professionals, which sent her on the assignment to Lee's hotel room.

Lee's convicted felon former assistant, Mac 'Max' Anderson, arranged the massage, according to the complaint, which also names him as a defendant.

Carballo says that Lee was on his stomach for the first massage when she noticed he was fondling himself.

Then he began moaning and groaning when she massaged his thighs, the complaint states, at which point she cut the massage short and agreed to be paid for one hour instead of two.

Carballo said she told her employer she was uncomfortable and didn't want to return for a second session the following day, but was told he was a 'VIP' and agreed to go back for fear of losing her job.

Lee is seen with his former assistant, the convicted felon Max Anderson (right), who allegedly arranged the massage. Lee fired Anderson in February

The second massage began around 10pm, and Lee again began moaning when she massaged his thighs, Carballo said. The massage therapist called off the session.

Naked, the nonagenarian hopped up from the massage table enraged, demanding the session continue, claims Carballo.

She reluctantly agreed but began using her feet instead of her hands for the massage, to keep more distance from Lee. That's when, she claims, he grabbed her foot and rubbed it against his penis and scrotum.

Carballo says she rushed out after Lee paid her $240 cash, and that Anderson approached her in the hallway outside to thank her and give her a cash tip.

Lee fired Anderson in February, amid claims the assistant was involved in a plot to drive a wedge between Stan and his sole heir, his daughter JC Lee. Anderson could not be reached for comment on the suit.

Carballo's suit says that she feared speaking out about the incident because of Lee's wealth and prominence, but was inspired by the #MeToo movement.

Lee is the former chairman of Marvel Comics, and the co-creator of many famous superheros including Spider-Man, the Hulk, Doctor Strange, the Fantastic Four, Daredevil, Black Panther and the X-Men.

Jonathan Freund, an attorney for Lee, told the Tribune that the suit is a 'shakedown' targeting his client due to his wealth.

'The guy is 95, I don't think he would do that,' Freund said.