|Residence||Ancient Mind Prison|
|Age||At least 1,000 years old|
|Abilities|| Advanced Acrobatics|
Advanced Weapon Skills
|Voice Actor||John DiMaggio|
|First Appearance||False Profits|
Rook Blonko is tall, with white and blue colored fur, black markings on his face, and pointed ears. Facial hair is underneath his chin. He wears a red and black battle suit, covering his entire body except for his head.
A very stoic, ancient being. Rook appears to show a sense of domination towards others. Not caring for the values of others and seeks to care only for his freedom at the cost of others.
Powers and Abilities
Rook is skilled in the arts of battle, and a expert in space and ground combat.
After spending many years trapped in a ancient mind prison, Rook was able to use abilities that he used to his advantage against other prisoners, such as reading minds, and creating illusions.
A millennia ago, Rook Blonko was a commander of the Revonnahgander Empire. He was a charismatic figure, skilled in the arts of battle, and a expert in space and ground combat. He played a major role in the defeat of a powerful enemy, known as the Contemelia, who made it their goal to destroy all life in the galaxy. The strategy and tactics Rook used allowed the Empire to turn the tide to their favor.
When the Emperor was killed during the final hours of the conflict, it was decided that the Emperors Advisor's would take his place as leaders of the empire. However, this angered Rook, who believed he was worthy of assuming the throne for himself. His plan ultimately failed when he tried to seize control, and his essence was trapped into a mind prison as punishment for his actions.
In the present, Rook discovered Argit and Ben Tennyson inside the prison. While Argit was unable to handle himself while inside, Ben was able to keep himself together. After Rook explains the situation Ben was in. He observed his memories in order to find out who he was. When Rook fails to convince Ben to allow him access to his body. Rook attempts to force Ben giving up, but fails when Ben uses his mental strength to use a projected Ultimatrix and several of his aliens from his mind to defeat the alien. After the alien acknowledges Ben's mental strength, he gives up, welcoming Ben an eternity of imprisonment. However, due to his strength being weakened, Rook no longer had authority over the prison, allowing Ben and Argit to return to their bodies. The fate of Rook is currently unknown.
- Rook was originally planned to be a secondary character in the series.