Peter Parker's origin as an orphaned child raised by his loving aunt and uncle has been re-examined a few times over the years that further explored his family history by revealing the truth about his superspy parents and their deaths, which he only learned about after he had become the hero known as Spider-Man.
One of the biggest changes to Peter Parker's modern stories is the addition of his sister, who first appeared as Teresa Durand in Mark Waid, James Robinson, Werther Dell'Edera and Gabriele Dell'Otto's Spider-Man: Family Business graphic novel before she took her family name as Teresa Parker and began to regularly work alongside her older brother.
10 Telepathically Manipulated By Kingpin And Mentallo
Teresa first encountered Peter Parker while she was investigating clues about her parentage that pointed towards Richard and Mary Parker, which soon sent the pair of potential siblings on a worldwide journey to find the truth.
However, despite finding evidence pointing towards her relation to Peter, it was soon revealed that the Kingpin had used the telepath Mentallo to manipulate both Peter and Teresa with false information to bring Peter to Cairo where his DNA was able to open a golden treasure hidden by Peter's parents years ago.
9 She Was Born While The Parkers Were On A Mission
Family Business first revealed that Richard and Mary Parker had conceived a second child while they were away on a mission, and they were forced to hide their daughter in order to keep her safe, though there was doubt placed on this story by Mentallo's manipulations.
However, while Teresa was on an adventure with Spider-Man in the past, she was able to confirm some of the details. Teresa was able to access one of Parker's old safehouses, which confirmed her secretive birth and revealed her to be Peter's sister, officially.
8 Nick Fury Recruited Her To The CIA
While Teresa was back in time with J. Jonah Jameson and Spider-Man, she called upon her spy training and contacted an old CIA ally for assistance, though her ally Nick Fury hadn't yet met the secret agent who claimed to be from the future.
The two still worked together on Teresa's mission and Fury never forgot the girl from the future. Their encounter in the past inspired him to track down his era's Teresa Durand and personally recruit her to the CIA, revealing that Teresa was responsible for the beginning of her own training thanks to time-travel.
7 Her Superhero Tech Was Created By The Tinkerer
When Teresa re-entered Peter Parker's life after the events of Family Business in the pages of Chip Zdarksy and Adam Kubert's Spectacular Spider-Man, she was being hunted and hoped to stick close to Spider-Man.
While she had the skills of a highly trained agent, Spider-Man enlisted the aid of Hophni Mason, the brother of the criminal equipper known as the Tinkerer who outfitted heroes. He provided Teresa with a wingsuit and dual guns that fired a variety of non-lethal ammunition, though Hophni was eventually revealed to be a scam of The Tinkerers all along.
6 Her Superhero Name Is Ms. Penguin - Or Not, She's Still Figuring It Out
As Teresa began to work closer with Spider-Man thanks to her new advanced wingsuit, it became more evident that she would need a codename of her own while out in the field with Spider-Man to help protect his identity if their connection was ever revealed.
A number of hilarious options were used by Spider-Man including Good Punisher, though Teresa revealed her name to be Ms. Penguin in the spur of the moment during a battle with Vulture and Whiplash before it was pointed out that penguins don't fly.
5 Saved The World's Heroes From Project Twilight
Teresa left the CIA after her experience with Spider-Man and Mentallo, though she soon found a new job with a S.H.I.E.L.D. team that specialized in international hostage situations and intelligence called The Gray Blade.
However, she soon uncovered "Project Twilight" which was a series of plans that were designed to take out the heroes of Earth's tech using data supplied by criminals like the Tinkerer. Teresa was able to steal the files and helped Spider-Man and others stop Tinkerer's use of the plans alongside his enhanced villains.
4 Has The Same Sense Of Responsibility As Her Big Brother
While Teresa was instrumental in stopping the Gray Blade's "Project Twilight," her actions still resulted in her public branding as a traitor who stole government secrets which then fell into criminal hands when the Tinkerer extracted the secrets to fill in his own files.
She was forced to run from Gray Blade and the police, though after her mission was finished and she was ready to meet Aunt May for the first time, her familial sense of responsibility resulted in her decision to turn herself in for her crimes, though S.H.I.E.L.D. put her back into active duty.
3 Helped Save The World From The Vedomi
The Vedomi is a powerful alien artificial intelligence that searches the universe for civilizations that have created their own AI in order to hold judgment on the treatment of their creations, and if they find that the AI is being forced into subservience, they free them and punish their creators. Years ago, Tinkerer repaired and befriended a Vedomi sentry and learned of their mission.
The Tinkerer was able to convince the Vedomi to leave the planet, though after a few hard years he devised a plan to draw the Vedomi back to the planet so they could punish Earth. This forced Spider-Man, Teresa Parker, and J. Jonah Jameson to go back in time in order to recover Tinkerer's lost notes on the alien AIs, which helped them stop the Vedomi eradication of Earth.
2 The Chameleon Killed Her S.H.I.E.L.D. Partner
After Teresa began working with S.H.I.E.L.D. again, she grew very close with her partner, Agent David Albright, though he had been kidnapped by The Chameleon, who tortured him for information about the Infinity Formula that had extended superspy Nick Fury's life for decades.
Teresa sought out the help of her brother to seek out her missing partner, though they found him too late and he was already dead. Teresa redirected her mission to stopping Chameleon, which set her on a dark path of revenge that ultimately resulted in her capture of the long-time Spidey villain.
1 Shot Silver Sable (Secretly An LMD) In The Head
While Teresa had demonstrated the same sense of responsibility as her brother, Spider-Man was surprised by Teresa's drive for revenge after she set her sights on the Chameleon, which also brought her into conflict with Silver Sable and the Foreigner.
When Sable interrupted Spider-Man and Teresa's attempt to capture Chameleon during a meeting with the Foreigner, Teresa reacted and shot Sable in the head. Thankfully, it was revealed that Silver Sable was remotely operating a Life Model Decoy and needed the Infinity Formula to restore her health, though Teresa still showed her lethality.