"Yeah, that's right, I'm Finnish. Cause' when I start a beatdown I always FINNISH it! "
Owen Rocksteed is a member of the same gang as Bebop. He is the incarnation of Rocksteady.
Rocksteady appears in the sequel to the 2014 action film, Teenage Mutant Ninja Turtles: Out of the Shadows. The rap sheet in prison guard Casey Jones' hand lists Rocksteady's name as Owen Rocksteed. Rocksteady and Bebop were originally two criminals being transported at the same time as the Shredder. They provide assistance in Shredder's rescue and escape themselves; in return, Shredder hires them as "errand boys." He selected the pair to be test subjects for a new variation of the Mutagen which taps into dormant animal DNA in their system from a point before life on Earth began to evolve in different routes, causing them to mutate into their familiar states. After Baxter Stockman initiates the procedure, Rocksteady becomes a humanoid mutant white rhinoceros.
While portrayed as more competent than his cartoonish incarnations, Rocksteady is a powerful fighter but tactically limited; he and Bebop constantly goof around, are easily distracted, and at one point Rocksteady becomes completely carried away in the heat of battle and attempts to shoot at the Ninja Turtles with a machine gun mounted on a tank while they are in a plane, resulting in him destroying the cockpit and sending the plane into a crash-dive into a river. He and Bebop were eventually captured by Casey Jones. There are no scenes in the movie in which Bebop and Rocksteady are seen apart.
Rocksteady and Bebop appeared in an early draft of the 2014 film called "The Blue Door" where they were aliens from Dimension X. They didn't make it into the final film due to budget reasons.
This is the first live-action appearance of the character.
This is also the first time Rocksteady's human form is represented as a bearded redhead, in all his other versions he's a beardless blonde man.
According to Bebop his ancestors are from Finland.
He has gears and Celtic crosses tattooed on his left arm.
This is the second version of Rocksteady to feature tattoos on his arms, the first being the IDW version.