The Superhuman Gambit

 is a Fallout 3 quest. It is also an Xbox 360 and PC achievement.

Objectives and Walkthrough
The town of Canterbury Commons has become the battleground of two self-claimed "superheroes" - the AntAgonizer and the Mechanist. Its inhabitants are not very happy about it and want you to help them get rid of them.

Upon arriving in Canterbury Commons, the AntAgonizer and the Mechanist will be engaged in a brawl. Once the dust clears, Uncle Roe will speak to you, asking you to handle the ordeal. After you have accepted the quest, speak to Derek Pacion. He gives you the best info on where to find them. The AntAgonizer lives in a cave north of town and the Mechanist lives south of town in a old robot factory. (Both locations will be marked on your map.) With the Child at Heart perk, you can ask Derek for their weaknesses. The Mechanist doesn't harm the innocent, and other than the royal guard, the AntAgonizer's ants are weak.

AntAgonizer's Lair
If you decide to take out the AntAgonizer, you head to her cave north of town. Inside, keep an eye out for frag mines. (The path to the right takes leads to random equipment that is guarded by a combat shotgun trap.) Down the stairs and to the right is an empty room. A button on the wall lowers a staircase to a cave. Continue through the cave, killing a few ants and you'll soon reach her lair.

Alternatively, you can sneak in the back entrance, a pipe to the west of the entrance at the top of a mountain of rocks (requires a lockpick skill of 50.) This route bypasses all of the ants in the tunnels. It is also possible to use this entrance if you pickpocketed the AntAgonizer's key during the brawl when first entering town.

In her lair, there are no ants to fight, just the AntAgonizer. Speaking with her, you can either decide to kill her, or help her destroy the Mechanist.

If you give the Mechanist's suit to her (regardless of how you got it), you will be awarded with the Ant's Sting, a knife that poisons an enemy for an additional 4 damage per second for 10 seconds, and negative karma.

The Lady Killer perk or a high enough Speech skill, coupled with possessing the note that gives you her real name, will give the player a dialogue option to convince her see the error of her ways. Selecting it will make her stop being the AntAgonizer and leave, giving you her funny outfit. Be sure to keep it if you plan to also convince the Mechinist to end his "career": he will want to destroy it.

Alternatively, if you have been to Hubris Comics and read the note to the editor about AntAgonizer's canceled Grognak the Barbarian comic, you can use this to point out that she can still be redeemed. Doing so will yield good karma. This bypasses the gender-specific perk and means you don't need to make the very tough speech check. You will also receive her armor.

If you are wearing the Mechanist's costume, she will attack you.

Mechanist's Lair
If you decide to visit the Mechanist, you can attack him, have him join you against the AntAgonizer or talk him out of the whole thing.

To reach his lair without having to fight through his robotic security, you can lockpick the elevator near the entrance with a skill of 75 or above, bypassing the heavily guarded stairs. Otherwise, the facility is broken up into four sections: Office (left of Entrance), two Maintenance areas (Sector A and B, which are connected by a control room on the upper level) and the Forge (where the Mechanist is hiding). Sector B is closest to the entrance (metal door past the elevator), and the Forge entrance is on the upper level of Sector A.

The security terminal for Sector B is in the control room on the upper level, which allows you to disable the automatic turrets and security robots. The emergency security terminal for Sector A is located in a small control room near the back of the bay, close to the Forge entrance (upper level). From this terminal, you can disable the automatic turrets in this room, as well as emit an emergency pulse explosion that will destroy any active robots in this sector.

Once you enter the forge, activate the coffee maker to reveal the Mechanist's lair. While you're here, there's a huge amount of scrap metal and energy cells to be found in the facility (including a Nikola Tesla and You book in Sector A).

Convincing the Mechanist to end his superhero career and leave the town alone will grant you his suit, and positive karma, though you might feel a little bad about it afterwards. The Black Widow and the Child at Heart perks give a dialogue option to tell him he is scaring the whole town. With that, he will give you his suit and leave. Giving him the AntAgonist's suit (regardless of how you got it) and encouraging him to continue his superhero ways grants you Protectron's Gaze and negative karma. Protectron's Gaze is a laser pistol that fires bursts of laser fire like a shotgun. You can receive both the increased reward and the pistol by giving him the suit, receiving the pistol, and then killing him after the conversation. You can drop the AntAgonist's Helmet to the ground and give him only the armor, then kill him and get 2 AntAgonist's Helmet's in that way (to repair and get an AntAgonist's helmet with DR 6).

Completion
Once you defeat either superhero, return to Uncle Roe to receive 200 caps. [400 if you got successful speech].

Should you succeed in talking both of them into ending their "careers" (or just leaving Canterbury Commons) you will receive 200 more caps; 400 even if you didn't succeed in the speech attempt when given the quest, or 600 if you did.

Alternatively, you may kill one or both immediately upon entering town (they're invincible for a short time while talking, but can be harmed soon after). Doing this grants you whatever that one had on him/her, as well as 400 caps from Uncle Roe (without ever needing a Speech check).

Tips

 * There is a Stealth Boy on a shelf in the installation area of AntAgonizer's Lair. It can be used to sneak pass Sector B of the Mechanist's Lair. This makes it possible for a low level to reach the Mechanist without any investment in lockpicking.