Kick-Ass Wiki
Doctor Gravity
General Information
Real name: Samuel Fredrick Keers
Aliases: Doctor Gravity
Alignment: Good
Affiliation: Justice Forever
Portrayed by: Donald Faison
Appearances: Kick-Ass 2

Kick-Ass 2 Kick-Ass & Doctor Gravity vs Thugs


Kick-Ass 2 Kick-Ass & Doctor Gravity vs Thugs

Doctor Gravity is a character in the featured in film Kick-Ass 2. He is a member of the Justice Forever, and is the first superhero Kick-Ass establishes contact with during the film, aside from Hit-Girl.


Kick-Ass 2[]

Doctor Gravity claims that he is a physics professor online, though this turns out to be false when he goes on patrol with Kick-Ass. He goes on to claim that his bat is really a device that can change the gravity of any object, only to quickly reveal it's a baseball bat wrapped in tinfoil. Gravity then tells Kick-Ass about a team named Justice Forever, and offers him membership, which Kick-Ass accepts. The two then fight off two thugs before finishing up their patrol.

Doctor Gravity greets Kick-Ass when he arrives at the Justice Forever headquarters, where Kick-Ass is inducted into the group. Gravity is absent during the team's attack on Jimmy Kim's prostitution ring due to a flu.

Later, Kick-Ass's father is killed by the Mother Fucker. Doctor Gravity and the rest of Justice Forever attend the funeral in sympathy, only for it to be attacked by Mother Fucker's Toxic Mega-Cunts.

Doctor Gravity later joins Kick-Ass, Hit-Girl, and an army of superheroes in a final battle between heroes and villains, he fought against Goggles and losing the fight. Realizing he's sporting a new and improved bat which now has spikes that can pop out, which used to knockout Goggles and defeated him. After the battle, Doctor Gravity agrees to retire and joins in disbanding Justice Forever.

However, in civilian form, Doctor Gravity is shown to continue to do everything he can to fight crime.



  • He has a Weapon which he calls the Zero-G Device, which apparently can levitate anything with the press of a button, which he later reveals to be a baseball bat rapped in Tin-Foil.
  • He later gains a new one, which when he presses a button spikes pop out of the sides.


  • Canon (1 film)

Behind the scenes[]

  • He is based on his comic counterpart and his costume design remains the same with an atom-like symbol.
  • It is revealed that actor, Donald Faison, did martial arts training for this movie.