A lifer serving his sentence at Strangeways brutally attacked a female prison officer, targeting her because she was the 'smallest and most defenceless' victim he could find.
Carlos Racitalal, 34, repeatedly punched the woman to the face, then started kicking her when she fell over.
Racitalal is serving a life sentence for attempted murder after a series of random attacks in Leicester.
In one, he slit the throat of a 10-year-old boy.
Racitalal also stabbed a mum in the head as she walked down the street with her children; knifed a man in his 70s; and deliberately drove his car at five-year-old girl in an Asda car park.
He was later found guilty of four counts of attempted murder, and is serving a life sentence with a minimum term of 29 years and six months.
Racitalal had another six months added to his sentence for the 'unprovoked' attack at HMP Manchester.
He had been for a shower and was cleaning his cell, when he emerged on the prison landing on June 22 last year.
The officer knew Racitalal and there hadn't been any previous incidents between them, prosecutor Betsy Hindle told Manchester Crown Court.
Racitalal moved towards her, and she thought he was going to ask her something.
But without warning, he began punching her with 'great force', landing several blows to her face and head.
She fell to her knees, and Racitalal kicked her to her ribs.
Her fellow officers raced to the scene and restrained him.
"It was an explosion of gross and wholly unnecessary violence," the judge, Recorder Sarah Johnston said.
The officer suffered bruising and swelling, and has experienced 'minor hearing loss' which may be permanent.
The court heard her ordeal has affected her confidence.
"In the past I would go out of my way to help prisoners, but now I only tend to do what is required of me," she said.
When he was interviewed, Racitalal admitted having 'anger issues', and said he chose to attack the officer because she was 'the smallest and most defenceless'.
Defending, Shaun Esprit said the attack on the prisoner would present 'another hurdle' for Racitalal, in eventually trying to persuade the Parole Board he is safe to be released.
He will be in his mid 50s before his case is considered.
"You have a very long time to make amends for your offending, and demonstrate this behaviour is not to be repeated," the judge told him.
Racitalal, who said said to be 'embarrassed and ashamed' for his actions, pleaded guilty to assaulting an emergency worker.
