Alternate Ninth Doctor

WARNING: - Spoilers Below!

The Ninth Doctor aka Nth Doctor, is a incarnation of the Doctor between Seven and Eight.

Regeneration
The Eighth Doctor played by, (Paul McGann) regenerated into this incarnation due to being shot by Daleks on Gallifrey causing him to regenerate, with regeneration energy.

Backstory
This Doctor is more of a cruel-type of Incarnation who only cares of his Friends and who-ever disregards him he makes them suffer in revenge.

Appearances
The Time War Written by Rob Shearman

Destruction of Skaro Written by Ben Aaronavitch

Pilots of the Titanic Written by Mark Gatitis

The End of Time Written by Rob Shearman & Steven Moffat

More about the Nth Doctor
The Nth Doctor (Ninth Doctor) was known for, sometimes having a comedic attitude and mostly had smart resolutions to his plans/ideas otherwise he was a Brainiac.