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Rocky is a polar bear cub who was the prison pet of inmate Jay Elbird assigned as part of the prison's animal therapy program. Rocky was almost always seen grabbing onto the front of the prisoner's vest, which Elbird didn't mind as the bear acted as an additional weight when he was doing his boxing training. There was a deep bond between the two, although Elbird became annoyed at Rocky when the latter's following of him ruined his plan to escape from the prison.

Foiling a prison escape[]


Rocky blowing Elbird's cover.

In March 2019, during a show performed by the Berry Big Circus, Elbird left Rocky in the care of Frank Sahwit, intending on escaping prison. However, while Sahwit was applying mud packs to Rocky, the bear escaped to search for his owner. In chasing after the bear, Sahwit witnessed Anubis, Sirhan Dogen's dog, apparently killing Horace Knightley. Meanwhile, Rocky caught up to Elbird and leaped onto him; this incident was caught on a security camera, and was later initially mistaken for Anubis attacking Knightley.

During the investigation into Knightley's murder, Elbird once again attempted to escape, this time by stealing a prison guard uniform and disguising himself. However, after Rocky ran into the room and jumped onto him once again, his cover was quickly blown.


Rocky adores Elbird, and so was frequently seen latched onto the front of his torso. His emotional attachment to Elbird was such that his two instances of foiling the prisoner's escape attempts could be seen as deliberate.


  • Japanese - Mark (マーク):
    • Mark is the Japanese word for bear (熊 kuma) spelt backwards.
  • English (Unofficial) - Rocky:
    • Likely a reference to the Rocky film series, owing to Elbird's boxing gimmick.