A college student carried out a "prolonged and sustained" rape on a woman attacked the two men who tried to stop the assault.
"Disgusting" Derrick Mutambuka had been drinking with a friend in Sunderland and became "sexually aroused" when dancing in a club.
After leaving the bar, Mutambuka, originally from Rwanda, began talking to a woman on the street - but after she appeared disinterested in him, he pushed her against some shop shutters and proceeded to force his hand down her trousers.
The terrifying sexual assault came to an end when a passer-by intervened and walked the woman home - however Mutambuka, who was 17 at the time, followed at a short distance back to her address and peered through her letterbox.
Newcastle Crown Court heard how just a short while later, the defendant then saw another woman in the street and dragged her into an alleyway before raping her.
A member of the public attempted to stop the rape after hearing the victim's terrified screams, but was forced to back off after Mutambuka kicked him and the assault carried on for a number of minutes - only to come to an end when a second man came to her rescue.
Prosecutor Andrew Espley said: "This was a prolonged and sustained attack. There was a significant degree of planning. He wanted it to happen and took steps to make sure that it did.
"He was a man that would not be deterred. Others were present and witnessed the victim's ordeal. The victims were alone and vulnerable."
Mutambuka, now 18, of Gateshead, was found guilty of rape and sexual assault following a trial - with what a judge described as "overwhelming evidence."
He was also found guilty of counts of assault, relating to the first man who he kicked and the second who he spat on, with spittle containing blood.
Mr Ekwall Tiwana, defending, said that his client was very drunk at the time of the offence and had only been drunk once before in his life.
He said: "The general nature of this case is that it is a very serious offence. Although it is very serious, it is not in fact the most serious. This defendant was 17 at the time and had no previous convictions.
"This young man was passed from pillar to post and country to country essentially. He has been subject to a very unsatisfactory life until he moved to Newcastle and studied in Gateshead.
"He has admitted that what he did was disgraceful and disgusting. He has recognised what he did."
The court heard how the defendant studied English, Maths and IT at Gateshead College.
The rape victim suffered 34 injuries during the attack, including reddening, abrasion and tenderness on her head, face, neck, legs and chest as well as on her genitals.
She was also punched and "manhandled" during the attack.
Sentencing him to nine years and nine months imprisonment, Judge Robert Adams said: "This was a persistent course of conduct.
"You were sexually aroused dancing in the club and that continued when you were going home until you committed the offence.
"You were determined to have sex with a woman regardless of her views or who she was or whatever her circumstance.
"You used violence, judging by the numerous injuries that the victim sustained.
"It is a start that you are experiencing some remorse although it is now too late in the day. Only a lengthy custodial sentence is appropriate."
Detective Chief Inspector Phil Bond said: "Mutambuka is very clearly a dangerous individual and I'm pleased he is in prison where he cannot cause further harm.
"I would like to praise the bravery of both victims for coming forward in these cases. The strength and courage of victims in incidents such as this can never be underestimated and ensuring they have the support they need is an absolute priority for us.”