Splinter and Shredder: Backstory (Movie)

Prequel Splinter as Human before coming rat 
== Story ==
Before Hamato Yoshi (Splinter) came to New York and before Oroku Saki (Shredder) became enemies. Hamato Yoshi and Oroku Saki trained Ninjutsu (Ninja) outside of Tokyo in a village. 
Their Master Mogo Sanjuro is the leader of the Ninja clan and Oroku Nagi is the deputy leader. 
Oroku Nagi is very mean to his apprentices especially Hamato Yoshi because he was the only one to speak up. 
Mogo Sanjuro talks to Hamato Yoshi about wanting Hamatos to take over as leader and master in case something happens to him. 
Hamato Yoshi should be honored but at the same time not because he is not the next coming leader and master of the clan and it is Oroku Nagi who is. Mogo Sanjuro doesn't trust Oroku Nagi anymore because of his toxic personality. 
Oroku Nagi was nearby and overheard their conversation. 
Oroku Nagi takes the opportunity to go to Hamato Yoshi's room taking one of his weapons. 
After Hamato Yoshi's conversation with Mogo Sanjuro. 
Hamato Yoshi goes out and afterwards and suddenly Oroku Nagi confronts Mogo Sanjuro. 
Oroku Nagi uses one of Hamato Yoshi's weapons when attacking Mogo Sanjuro. 
Then Oroku Nagi kills Master Mogo Sanjuro and frames Hamato Yoshi for Mogo Sanjuro's murder. 
It becomes impossible for Hamato Yoshi to clear his name because no one believes him because he is a student not even Oroku Saki. 
Oroku Saki has been ordered by Oroku Nagi to take Hamato Yoshi dead or alive because he's the new leader. 
Oroku Saki believes in his brother instead of his former friend. 
The only one who believes Hamato Yoshi is innocent is Tang Shen shortly after that her life is also in danger because she believes Hamato. 
Tang Shen is the stepdaughter of Mogo Sanjuro. 
She watched as Oroku Nagi killed Master Mogo Sanjuro. Oroku Nagi corners Tang Shen because she is the only one who can clear Hamato Yoshi's name. 
Afterwards when he saves Tang Shen he kills Oroku Nagi and at this moment Hamato Yoshi knows that he can no longer stay in Japan so he and Tang Shen escape to America.
== End Credit Scene ==
Oroku Saki find's Hamato Yoshi weapon that killed Oroku Nagi and now he hunting after Hamato Yoshi and Tang Shen.
== Character ==
*Hamato Yoshi / Splinter 
*Oroku Saki / Shredder 
*Oroku Nagi is older brother to Oroku Saki.
*Master Mogo Sanjuro
*Tang Shen 
*May Shen (Flashback) mother to Tang Shen
== Trivia ==
*Oroku Nagi beats up Tang Shen by jealousy in Mirage comic book.
*In version he jealousy of Hamato Yoshi because he get promotion to be the next master of the clan instead of Oroku Nagi.
*In the 1987 TV series Oroku Saki did have a younger brother Kazuo Saki who was a policeman in Tokyo.
*Tang Shen doesn't have backstory of her origin story in comics. 
*Idea of the name May is from release month May 1984.
*Idea of Mogo Sanjuro being character Mogo-San who appeared in 1987 TV series he did train Hamato Yoshi (Splinter).