Early Life[]
At an unknown point, Amanda was an adult, but then by ambiguous means was cursed, and was given the ability to turn into a giant green creature, she would use this form as means to control and be a hero. But the more she used this form, the more she de-aged, meaning her physiology was also reversed, turning her into a kid.
Becoming a Guardian[]
At the Pentagon, Robot and Invincible look at many heroes lined up, who will be selected to be the new Guardians of the Globe. However, Robot wanted Invincible to try out as well, but Invincible told him that his father wanted to train him himself. Robot thanks everybody for showing up to the try outs.
Eve faces a very strong man at the tryouts, and defeats him quickly, showing a lot of anger. Invincible asks Rex Splode what was going on with her, but he simply mentions he does not know.

Robot announced the new Guardians.
In the end, Robot introduces the new Guardians: Black Samson, Shrinking Rae, Dupli-Kate, Monster Girl, which makes Rex laugh since she was small, due to her young appearance he mentions there not being an age requirement, but Monster Girl asks if there was not a dick size requirement. She then claims that Rex must be compensating, which humiliates him in front of the entire organization. Rex gets angry and begins to activate his powers, stating that some should teach her some manners, but before he could even finish talking or activating his powers, she begins to transform and her arms grows huge which shocked him, she punches him with her huge arm and he is sent flying into the training arena. She transforms into a big green humanoid and hits him once again, this time even knocking out some of his teeth. Rex gets angry and uses his powers, but his powers turned out to be useless against Monster Girl. As she punched Rex, Invincible stopped her and told her to cut it out, but was simply thrown in another direction. Angry, he flies in her direction and hits her hard enough to send her flying into a wall as well as revert her back to her human form. He apologizes for having hit her so roughly, but she says that it is fine since she always got angry when called a little girl, also apologizing to Rex for her dick joke. Robot once again introduces Monster Girl as a Guardian and tells them that Rex would also join once he recovered. After that, he mentioned that Atom Eve would be the last member, telling them that he would be announcing it publicly later. Eve told him that she could not be on the same team as Rex and Kate and leaves.
Robot tells the new Guardians that when forensic investigations concluded, they would move into the Guardians' headquarters. He tells them their schedule and Rex complains that their training was too early, and they did not even need it. However, Robot tells him that they are no longer Teen Team and Black Samson tells him he needs experience. Rex points out that if Black Samson had not lost his powers, he might have been able to help the past Guardians, which angers him. Black Samson tells him to watch it and tells Robot they needed a leader they could look in the eye and not ones and zeros, saying that he could be the leader instead. However, Rex once again mentions that Black Samson had lost his powers and wondered why they needed to put up with him.
Shrinking Rae points out that teams needed teamwork, which Robot agrees to. Everybody leaves and Black Samson congratulates Robot sarcastically. After everybody left, Monster Girl told Robot that she could not do three combat exercises a day, but Robot said he needed the team operational. Monster Girl tells him that whenever she transform, she gets younger and even used to go by Monster Woman. Robot apologizes and sympathizes, but Monster Girl believes there was no way he could understand since he was just a Robot. From above, Omni-Man observes, describing what he had seen as pathetic.
Robot is interrupted from watching the Mauler Twin work by Rex, who welcomes him to the new Guardian's new digs. Black Samson mentions it is good to be home again, which annoys Rex since he does not enjoy hearing him say he was an original member of the Guardians of the Globe. Monster Girl tells Robot she is nervous, and Robot tells her that he is as well. Cecil walks in and tells them to not be surprised since it was their job. Rex tells him that he had missed a spot when cleaning blood, but Cecil tells them that he had left that there as a reminder and would get cleaned off when they proved themselves to be worthy of the heroes that had come before. He is radioed, told that Omni-Man wanted to see him, so he leaves. Monster Girl asks Rex if they are cool and he says they are since she had beaten him up in front of assholes. Robot walks up to Rex and tells him not to let his personal life to meddle with his professional one since it was his fault they were alienating Atom Eve and did not want it to happen with Monster Girl. Rex tells him that when he grew a pair, then he could tell him how to swing his. However, Robot mentions that he was giving him an order, patting him on the shoulder with a needle which slightly hurt Rex.
Not truly prepared[]
The new Guardians of the Globe celebrate a victory against the Lizard League. They all celebrate with beers except for Robot and Black Samson, who emits a high frequency, which shatters their bottles. He tells them that people were in the hospital because they had not fought as a team. They go through the fight and Black Samson lectures them on what they could have done to save lives, but Rex was unhappy and told him they had done their best and won.
Later, As Mark tries getting up while taking down Machine Head who had hired supervillains, he is thrown once again. Machine Head celebrates, but mentions he was getting a signal as the Guardians of the Globe show up. They mention that Cecil had gotten an anonymous call and would take it from there.

Dupli-Kate and Monster Girl fights Kursk.
Machine Head tells his supervillains to kill the Guardians, and they swiftly defeat them. Battle Beast mentions he believed Earth had worthy opponents and told Invincible that killing him would be an act of mercy. Black Samson tries to shoot at him, but fails and Invincible is struck in his stomach and stops responding. Black Samson gets up and runs toward Battle Beast, who rips his hand from his wrist and throws him, cracking his head. Monster Girl tries to defeat Battle Beast as well, but is also swiftly defeated.
Robot shoots at him and while the Guardians looked at their fallen friends, they told the supervillains that they had messed up. Working together, they share an intense encounter with the villains and defeat them except for Battle Beast, who says there was no honor in killing insects and leaves.

Robot holds Monster Girl after seeing she was badly injured.
Robot holds Monster Girl after seeing she was badly injured. Machine Head describes the events as strange and asks Isotope to get him out of there, but finds he does not respond and is hit by Rex. Mark awakens and Titan tells him that he did not mean for things to turn out the way they did before leaving.
Robot comforts Monster Girl and tells her he would fix her.
Invincible, Monster Girl, and Black Samson are rushed into the GDA's ER. Monster Girl was drowning in her own blood and was intubated, but as they took care of her, she turned into the monster. Robot walks in and tells them he had studied her physiology, which meant that if they got him out of the room, she would die. He tells them that Monster Girl's only hope would arise if they triggered her healing abilities.
At the GDA, Robot walks into a room, telling doctors that the levels they were seeing were normal for Monster Girl. He tells them he had sent a clone to the Arctic and had gotten a Cerulean Cosmos, which he believed would add 60% chance to her survival. He walks up to Monster Girl and Samson, from the other room saw he really cared for her. Robot tells him it was good to see him awake and explains that he was programmed to care for all humans, but he reminded him that he did not go to the Arctic for him.

Monster Girl finally woke when Robot touched her face.
Black Samson tells Robot that he feels even better than when he lost his powers. Robot tells him to go back to HQ while he remained there with Monster Girl recovered. When Samson left, Robot put his hand on her face and she suddenly awoke. She asks if they had won, and he says that they had thanks to her and he had never left while she recovered.

Amanda, now fully recovered from Battle Beast, is confronted or surprised by her friends from the guardians in a happy manner!
Monster Girl is welcomed back by the Guardians, who hug her. Rex tells them all they should party, handing her a milk carton which has beer in it. Monster Girl asks Black Samson why he had gotten his powers back, and he tells her he thinks it was because he was putting up with Rex. Robot tells her he is glad she had recovered and tells her he would never let her die, but repeated the word die many times, which the Guardians in shock.
Cecil tells the Guardians to be quiet and sit tight until they were called. Rex is desperate and says they needed to know what was happening, which Black Samson agrees with. He asks if Robot can find out, but Robot did not respond. Rex hits the robot on the head until they are approached by the new Robot. He presents himself as Rudolph Connors, saying robot was simply a drone he controlled remotely. Kate asks how they could know he was telling the truth and Robot says they could ask him anything. Rex asks why he looked like him, but Robot told him to wait.

Rudy surprised the Guardians when he explained his story.
Rudy tells the Guardians everything that had happened, but Rex still wants to know why he had picked his body. Everybody thought it was wrong that he had not asked Rex first, but Monster Girl realizes that he had done it for her. Rudy explains that Monster Girl was slowly getting younger and he was trapped in a mechanical tomb, while she was stuck as well. Monster Girl goes through everything Robot had done and says that she needs time to process it.
The Guardians watch Nolan and Mark's transmission as they fight. Dupli-Kate suggests going to help them, but Rudy tells them that they needed to follow Cecil's orders and stay in the bunker since the battle was beyond their capabilities. Black Samson agrees, but Eve flies in, asking what was happening. Rex tells her that Omni-Man was fighting him, so Rudy says that he hopes Mark lives up to his name.

The Guardians and eve watched Omni-Man fight Mark, deciding to help civilians hurt by the fight.
The Guardians watch as the fight between Omni-Man and Invincible unfolds. Black Samson tells them to gear up because even if they could not stop the fight, they could save lives. Rudy tries to remind them of Cecil's orders, but Shrink Rae tells him they do not care. Monster Girl walks up to him and reminds him he was not a Robot anymore.
The Guardians return to their bunker, exhausted. Rex walks up to the blood stain on the wall and cleans it, but Black Samson tells him that they had not earned it yet. Rex tells him to fuck off, but when Black Samson grabs him, the Guardians all support Rex, so Black Samson drops him and told him that they were finally a team, helping him with the stain.
During a training session, Monster Girl trains with Kate and helps her up.
Monster and Machine[]
A month after the Chicago incident, Monster Girl was seen helping the Guardians take down the Giant and saved Rudy from the Giant trampling him. Amanda asked why he froze, Rudy acknowledges that he was nervous and sweating, Amanda chuckles, replying that it is the human emotions interferring with his mind, fear, it was merely a video game when he was Robot, now he's here and tells him he'll get use to it just when he used the restroom.
Much later Amanda witnessed Robot being bumped down to a soldier post after a failed quick tag and bag with the Giant, and told Rudy to ignore Cecil but Rudy believes him to be right.
In Dallas, the Lizard League invaded a bio research facility. Amanda was seen dealing with the Lizard League.
In the Guardian's HQ, Kate, Rex and Amanda were all working out, Amanda was seen on the treadmill and stopped after telling the two that Rex didn't get Kate's reason for liking the Immortal.
Rudy then asks Amanda on a date and the two go to see a movie, but were denied showing because it was an R-rated film, however Amanda asked an adult for help, after they went to see the film, they then went to Burger Mart to get Rudy to learn more of his human biology.