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Ivan Steranko as a Mutant White Rhinoceros.

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Ivan Steranko as a Mutant White Rhinoceros wearing his counterpart's outfit.

Ivan Steranko Bio
Ivan Steranko as a human.

Real Name Ivan Steranko
Alias Rocksteady • Steranko • Cool Eyeball Guy • Big S • Baby Ivan • Rockhead • Bonehead • R • Rock
Gender Male
Species Human (Russian) (Formerly)
Mutant White Rhinoceros (Currently)
Occupations Russian Arms Dealer (Formerly)
Russian Mafia Boss (Formerly)
Ninja Assassin of The Foot Clan (Formerly)
Member of The Foot Clan (1987) (Formerly)
Team The Foot Clan (Formerly)
The Foot Clan (1987) (Formerly)
Allies Anton Zeck/ BebopThe Foot Clan (Formerly) • Purple DragonsItalian Mafia (Formerly) • Kavaxas (Formerly) • The Foot Clan (1987) (Formerly) • Ninja TurtlesApril O'NeilCasey JonesMighty MutanimalsThe Foot Clan (Karai)Ninja Turtles (1987)
Enemies Ninja Turtles (Formerly) • Splinter (Formerly) • April O'Neil (Formerly) • Casey Jones (Formerly) • Mighty Mutanimals (Formerly) • Kraang Hive MindTriceraton EmpireThe Foot Clan (Karai) (Formerly) • AlopexItalian MafiaKavaxasNinja Turtles (1987) (Formerly) • The Foot Clan (1987)
Weapons Golden HammerSickleKnuckledusters (see below)
Home Moscow, Russia (Formerly)
New York City (Currently)
Height TBA
Age 45
Hair Color Blonde (Human)
None (Mutant)
Eye Color Grey (Human)
Green (Mutant)
First Appearance Enemy of my Enemy (Human)
Serpent Hunt (Mutant)
Last Appearance Serpent Hunt (Human)
The Big Blowout (Mutant)
Voiced By Fred Tatasciore
You brought what I requested?

—Ivan Steranko's first line, Enemy of my Enemy

Ivan Steranko, aka Rocksteady, is an enemy of the Ninja Turtles. He was formerly a Russian arms dealer and Russian Mafia Boss with a prosthetic diamond eyeball, who was an old friend of Oroku Saki from the past. He was the boss of Anton Zeck, an African-American master thief who steals artifacts for him. One of Zeck's missions was to steal the Kuro Kabuto from Shredder, which Zeck does until Leonardo takes the helmet away from him. Due to a series of events involving him and Zeck capturing Karai to bargain with Shredder, he ends up mutating into a mutant white rhinoceros as a punishment by Shredder. Due to their mutations, the duo was forced to join The Foot Clan in order for them to live and to capture Karai once again. After Shredder was resurrected by Kavaxas and the demon takes over control of The Foot Clan, him and Bebop decide to leave the clan. Some time afterwards, him and his partner are both hired by the 1987 Shredder to his Foot Clan (to replace 1987 Bebop and 1987 Rocksteady). But once they were reformed and fought alongside the Turtles, 1987 Turtles, April O'Neil and Mighty Mutanimals to defeat 1987 Shredder and Krang, they quit their lives of villainy once and for all. He wields a Golden Hammer, a Sickle, and Knuckledusters as his signature weapons of choice. He has a rivalry with Leonardo, Raphael and Casey Jones. Ivan Steranko debuts in Enemy of my Enemy and Rocksteady debuts in Serpent Hunt.


As Ivan Steranko

Ivan Steranko was born to an unknown Russian couple and was raised in Russia alongside with his brother, Boltak Steranko. Ivan later on moved to New York City, where he started to work as a Russian arms dealer and apparently met Oroku Saki during his business. He also hired Anton Zeck as his own henchmen to steal artifacts for him, such as the Spear of Destiny and Excalibur. At some point, Steranko got one of his eyeballs shot by Zeck. Due to this incident, he had to get himself a prosthetic diamond eyeball. Even though Anton Zeck claims that it was an accident, it seems that Ivan Steranko does not forgive him for it.

As Rocksteady

During the events of the Kraang Invasion, Anton Zeck and Ivan Steranko were struggling to survive during the chaos taking place due to The Kraang. Since they barely had any food supply and they didn't want to rest becoming mutated, they decide to hunt down Karai to make a trade with Shredder for permission to leave New York City.
Zeck And Steranko Captured By Rahzar And Fishface
After a series of events that took place during the hunt for Karai Serpent, the two proceed to do the trading at the Docks. But once the Ninja Turtles came and interfered with this trading, a fight takes place between the Turtles, Anton Zeck, Ivan Steranko, and The Foot Clan. The fight comes to a conclusion once Karai has been set free, forcing the Turtles to retreat. Since The Shredder was angered by what occurred, he decides to take both Zeck and Steranko captive in order for them to get their punishment.
Zeck And Steranko Taken Into The Lab
Once the two were taken to the laboratory of Baxter Stockman, Shredder proceeds his punishment by mutating them both. After the henchman of Ivan Steranko, Anton Zeck, was mutated by The Shredder into a mutant warthog with his technological suit merged to his body, it was Steranko's turn to be mutated into a mutant white rhinoceros.
Steranko Falls Into The Mutagen
But Steranko, who didn't want to become a mutant, attempts to reason with Oroku Saki. He brings up the fact that he would be much more useful to his old friend as a normal human, not as a mutant. The Shredder made it seem as if he agreed with him, but he is pushed by Rahzar into the mutagen sphere.
Anton Zeck And Ivan Steranko In Their Mutant Forms
Once inside, the mutagen mixed with the white rhinoceros DNA causes him to mutate into such animal. After Steranko's mutation, the duo meet each other in their new mutated forms and are not pleased. So because of this, they attempt to fight off The Shredder with their new mutated forms, which they miserably fail to do so and are forced to join The Foot Clan in order for them to be kept alive. As their first mission, they must hunt down Karai once again and they must turn her in, or they will be punished further more. When the mutant duo were in Coney Island, Michelangelo gave them both the mutant names of Bebop (Anton Zeck) and Rocksteady (Ivan Steranko), due to the van they were driving.




Powers, Abilities, and Weaponry

As Ivan Steranko

  • Dart Gun
  • Grenade

As Rocksteady

  • Enhanced Strength
  • Horn
  • Golden Hammer
  • Sickle
  • Knuckledusters
  • Scatter Gun
  • Flamethrower
  • Laser Hand Gun


As Ivan Steranko

As Rocksteady



As Ivan Steranko

Season 1

Season 2

Season 3

As Rocksteady

Season 2

Season 3

Season 4

Season 5


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The Gallery of Rocksteady can be see Here.


  • In his debut episode, Enemy of my Enemy, Ivan Steranko's name was never mentioned during the episode, but it was seen in the credits as "Steranko". In his later return, The Legend of the Kuro Kabuto, Steranko's full name was revealed to be "Ivan Steranko".
  • Steranko has a hammer and a sickle molded on his knuckle dusters, which are the symbols of the Soviet Union.
  • Although Rocksteady is a white rhinoceros (as seen in a computer screen in Stockman-Fly's laboratory as shown in a silhouette of a white rhinoceros), his nose is shaped like a black rhinoceros since the white rhinoceros does not have a beak-shaped mouth. This could either be an animation error or the DNA placed in the mutagen was a mixture of both rhinoceros species.
  • Ivan Steranko shares his last name with Jim Steranko, a famous comic book artist.

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