The Time War

Time Lords vs Daleks... where Time itself is used as a weapon... The entirety of time and space on the verge of being destroyed, and only one man to stop it.

I think I'll leave this up to The Doctor...

What happened?
'My planet's gone. It's dead. It burned... It's just rocks and dust. Before its time... There was a war. A Time War. The Last Great Time War. My people fought a race called the Daleks, for the sake of all creation. And they lost. We lost. Everyone lost. They're all gone now. My family. My friends. Even that sky...'
~~~~~
The Doctor: Your race is dead! You all burned, all of you! Ten million ships on fire! The entire Dalek race wiped out in one second!
Dalek: You lie!
The Doctor: I watched it happen! I made it happen!
Dalek: You destroyed us?!
The Doctor: ... I had no choice.
Dalek: And what of the Time Lords?
The Doctor: Dead. They burned with you. The end of the Last Great Time War.
~~~~~
'I was the only one who could end it. And I tried, I did; I tried everything.'
~~~~~
Rose: The Dalek survived, maybe one of your people did too?
The Doctor: I'd know in here. Feels like there's no one.
~~~~~
The Master: The Time Lords only resurrected me because they knew I'd be the perfect warrior for a Time War. I was there when the Dalek Emperor took control of the Cruciform. I saw it. I ran. I ran so far... because I was so scared.
~~~~~
'I'm a Time Lord. I'm the last of the Time Lords. They're all gone. I'm the only survivor...You think it'll last forever... But it won't.'

The Aftermath
The war had consequences up and down history. Although the name of the Time Lords lived on in legend and myth, the universe was a changed place....

'...when the Time Lords kept their eye on everything, you could pop between realities and be back in time for tea. Then they died, and took it all with them. The walls of reality closed, the world was sealed, and everything became that bit less kind...'

Although The Doctor contemplates using the TARDIS to travel back to before the war and save his race, he knows that this will create a paradox by crossing his own timestream. He also is tempted by the by the power of the Skasis Paradigm which would give him the ability to reorder the universe... 'I could stop the war'... but, as he frequently comments: there was nothing he can do, and he can't change it now...

Those effected by the war
'The Time War raged, invisible to smaller species but devastating to higher forms..'

• The Nestene Consciousness - it's planet was destoyed in the war.
• The Gelth - their bodies had been destroyed by the war.
• The Time Lords - Destroyed, erased from existence.
  
• The Daleks - Exterminated.
  
• The Doctor - left to live with the consequences of his actions and travel on, the last of his kind...

The Time Lords in the Time War
The Time Lords tried to move Gallifrey to the present day by using the Master, but ultimately failed...