Previously on Doctor Who Series 4…

Rose winces against the floor grabbing her right leg. The Doctor asks worriedly, "What's wrong?"

"My leg. I was shot."

The Doctor explains to Martha, "Abel's been jumping around time following us based on your memories and the only way to see how the story ends is to follow the trail of time events itself."

Dalek Caan stands by Abel in a room, "The-Dal-eks-on-ly-know-one-way-of-life. Ex-ter-min-ate."

The Time Lord frightenly called out, "Rose! Dodge left!"

Abel does not show a hint of being intimidated as he addresses the Dalek, "You came to me asking ME for help. You need me; therefore, I am YOUR master."

"I-o-bey."

The Doctor stares out at a Time Lord citadel from the TARDIS completely unbelieving and terrified with Rose and Martha behind him.

Martha warns Abel, "Just when you think you have the upper hand Caan'll kill you."

"Not when I have something he wants, he won't."

The Doctor commands his companions, "Run!"

"This… this can't be here! No, there's no way! Everything is gone. This is impossible!"

Abel looks Rose in the eyes. "I'd much rather see the big bad wolf dead."

Martha comments, "What the…?" as a shadow of a large object above the skies passes over her and her companions blocking out the sun…

The Doctor mutters with a sense of foreboding, "Someone has been waiting for us."

Rose tells Abel, "The army. You're building up a whole fleet of Daleks."

The Doctor softly grins while touching a plane of glass. "I can feel it. It's so beautiful. I can sniff it and taste it and it's so sweet. I've missed this!

The Doctor tells Rose as if holding back a big secret, "You… that is you, Rose Tyler are going to die..."

A silvery wall suddenly surrounds the Doctor, Rose, and Martha individually before the scenery around them begins to faze out of existence. Now, a new location fills their vision of being inside golden painted walls on a ship in space with a window to the right full of a starry sky.

A gun is cocked and Abel's voice proclaims happily, "Welcome to the S.S. Bad Wolf."

Read "Caan and Abel," the previous installment in the three part finale if this trailer isn't enough background.