Vader discovers the truth about Leia on the DS1

[Wanderer]

Here is the op as it appeared in my mind.

Vader's med droid blows its motivator and he is forced to use a Human Physician on the DS1 until a replacement arrives from Coruscant. Also because of this his DNA is entered into the DS medical database where it is compared with other DNA, where before Vader's medical information was separated from all Imperial medical databases.

The physician while going through Vader's medical files notices that family history has been updated. Looking through it, he notes that a DNA paternity match has been found with Princess Leia when the interrogation droid drew a blood sample. Being a Tarkin supporter, he realizes he has the perfect political weapon for Tarkin to utilize over Vader. A com call tells him that Tarkin is on the Overbridge and not available at the moment. The physician makes an appointment with Tarkin.

Unfortunately for our physician, Vader is a bit paranoid about his privacy in human hands and when he accessed Vader's medical files Vader saw what he saw flash across his eyes. Just as Tarkin is saying, "You may fire when ready."

At this point my imagination failed me. So what do you see as the looming implications and events to follow.

[Solauren]

Vader voices an objection to blowing up Aldeeran. Perhaps just blowing the shield away.

Tarkin blows up the Death Star

Vader reveals to Leia he's his father, and can help her take revenge on Tarkin and the Emperor.

Kenobi showing up on the Death Star, after finding out the Princess with the rebel plans was his daughter, gets his interest, and he refuses to let the Falcon be used to find the rebel base. leia will eventually tell him.

So, the heroes are captured. Vader quickly figures out Luke's his kid.

Kenobi's failure is complete. Vader ends up with the twins after all, and now has the means to dispose of the Emperor.

[FedRebel]

At this point my imagination failed me. So what do you see as the looming implications and events to follow.

1. Vader ensures Leia's death ASAP, she is threat to him as Tarkin or perhaps the Emperor could use her against him, alternatively her association with the Rebellion make her a direct threat to him.

2. A rescue is staged by forces loyal to Vader (via a faked execution) whom proceed to take Leia to a safehouse somewhere, said individuals are instructed to treat Leia as they would a loyal senator, until Vader arrives.

When Luke and friends make it to the DS they find that Leia is "dead", they manage to disable the tractor beam and fight their way out of the hanger (Obi Wan still lets himself get killed by Vader). Unfortunately with no Leia, there is no reason to let the Falcon go, so it gets shredded to pieces by hordes of TIE's.

When Vader makes it to the safehouse he exhaustingly tries to win Liea over to his side and direct her hatred towards the Emperor. Additionally Vader exploits any available opportunities to justifiably discredit the Rebellion, and ensure that Leia witnesses those incidents in person with a POV which casts a certifiable negative view of the Rebellion.

The Emperor senses Vader's deception and arranges a trap to turn Leia into his apprentice and have her kill Vader.

Now pick one...

A: Leia affirms her loyalty to her father, she and Vader together kill the Emperor
B: Leia turns to the Emperor's side and kills Vader, with the Emperor cackleing in the background
C: Leia goes full on Sith and kills both the Emperor and Vader
D: Leia affirms her dedication to the Republic and democracy, she kills both the Emperor and Vader
E: No matter Leia's decision, the Emperor plays "lightning round" and wins

[Ghost Rider]

He gets a twinge of old love, then doesn't care, and proceeds as things are.

Luke gave him that feeling because he was STRONG in the Force, and had the ability and training to use it. He was extremely pivotal Vader's plans and being his son was even bigger bonus. Vader wouldn't give a damn is some bint of a princess was his daughter, who's shown virtually no sign of ability or power. She's at worst a liability because of a family connection.

[Tsyroc]

I'd have to agree with GR.

If Leia was going to have much of a chance with Vader it would only be if Vader had previously thought she reminded him of Padme...and had good thoughs.

If she reminded him of Padme and all he felt was pain he could just as likely go off and kill her even sooner. I mean, if Vader is staying away from Tattooine and Naboo because of the emotional pain they dredge up then I don't think he's going to like being reminded of Padme by some vocal girl with no powers who has already shown her self to be allied with Vader's enemies.

Luke has the benefit of showing real power (something useful for Vader)and being more like the old Anakin.

[MKSheppard]

He gets a twinge of old love, then doesn't care, and proceeds as things are.

Nope.

The ENTIRE REASON he went on the entire "turn to dark side" thing was to save Padme. If he finds out that she gave him two kids; it would really severely shake him up.

What, you think that Vader just said "Join me and we can destroy the Emperor together" out of a whim; considering that at the end of ROTS, Palpatine was his only friend left in the world?

Most likely what would happen is he would cancel the destruction of Alderaan, and find some other alternative method of getting the information out of Leia.

When Obi Wan and Luke show up however, Obi Wan gets viciously dismembered by a brutal Vader; who slowly kills Obi Wan limb by limb. Cut off an arm, then a leg; then burn him alive!

[Ghost Rider]

Sometimes I wonder if you even watched the same flicks.

What was his primary reason that he didn't kill Luke, why he PLEADED with the Emperor his way was better?

Oh that's right, Luke was STRONG in the Force. Strong enough in Vader's eyes to destroy the Emperor.

Did Leia even demonstrate an inkling of even doing anything to upset to upset the balance of what the Sith were. I want to see this proof that you can even present that would make anyone see the logic of your assumption.

[MKSheppard]

What was his primary reason that he didn't kill Luke, why he PLEADED with the Emperor his way was better?

And look at who he's talking with and about.

You think telling Palpatine "Please don't have Luke killed, he's my son!" will work? Vader's been working for Palpatine for 20 years now. He's got to have a credible reason to keep Luke from being killed arbitrarily -- the kid's caused no end of great pain to the empire; RE: Death Star, various adventures between ANH and ESB.

[eyl]

Most likely what would happen is he would cancel the destruction of Alderaan, and find some other alternative method of getting the information out of Leia.

Why? Even assuming he finds some feelings toward Leia (and at that point, it seems to me he was still too deep in the dark side - even in the later movies, he came very close to killing Luke, who he knew was his son), I don't see him trying to stop Alderaan's destruction, as Leia is no longer on it (presumably Tarkin might not destroy Alderaan if Vader wouldn't let him interrogate Leia, but that's doubtful, since part of the purpose was to serve as a demonstration strike).

[Wanderer]

As to Alderaan: Vader would have had one reason to try to intervene there - keeping his daughter from the emotional harm. In doing so, he would have had to feed a story to Tarkin.

Why not say it would be a better ideal to take the Planet, Bail Organa, and whatever files he is keeping, and sift through them for intelligence. Who knows, Bail might have information on the rebels financial providers or locations of rebel bases.

This would be a windfall for the Empire as they can prove to fence sitters that Bail is a traitor and got what he deserved. Men like Tyco Celchu could very well stick with the Empire.

[Crown]

Ghost Rider; sorry mate, I have to disagree with you on this one, Leia is canonically as potentially powerful in the Force as Luke;

You're wrong Liea, you have the same power as I do, and in time you'll learn to use it, as I did.

From RotS, we get more insights as to why Vader was so obsessed with Luke in the OT; it was a second chance at his fantasy of overthrowing his Master and ruling the Galaxy as Emperor and Empress with Padme, he changed this to 'father and son', if he discovers the truth about Leia he would just further change this to 'father and daughter', as indeed he told Luke in RotJ;

So, you have a sister? If you will not turn to the Dark Side, then perhaps she will!

What, and how, he plays this (finding out at that point in time), I'll leave to the fanfic writers.

[ArcturusMengsk]

Keep in mind that Leia does indeed possess Force potential, according to the EU, but her diplomatic and governmental duties in the New Republic keep her from harnessing it to the fullest.

[Crown]

Keep in mind that Leia does indeed possess Force potential, according to the EU, but her diplomatic and governmental duties in the New Republic keep her from harnessing it to the fullest.

Why even bother with the EU? Luke, Yoda and to a lesser degree Obi-Wan and Vader all say so in the movies!

[Macross]

I don't think Episode IV would have changed all that much, but Episodes V and VI would play out with Vader trying to turn Leia the same way he tried to turn Luke.

Being on the Death Star he would immediately recognize Tarkin and the Death Star as threats to him, so when Obi-Wan and the Falcon show up, he allows the princess to escape and tracks the Falcon to the hidden Rebel Base, only this time he would deliberately allow the Rebels to destroy the Death Star.

Since, he wants the Death Star to be destroyed, he probably would not fly out to personally fight the Rebels, so he would not encounter Luke.

The first half of Episode V would also play out the same. He pursues the rebels and tracks them to Hoth. Then he pursues the Falcon to Bespin. Since Vader is not after Luke, there is no need to stick around on Bespin once Leia, Han and Chewie are captured.

He gives Han and Chewie to Boba Fett, who takes them to Jabba the Hutt, and Vader immediately begins to train Leia.

Luke stays on Dagobah until Yoda's death and then rejoins the Rebels.
Since Han and Chewie are dead, Luke is alone when leads the strike team to Endor, this is when Vader first senses Luke and he allows the shuttle to land. The appearance of a Jedi is the perfect test for his new apprentice, who he sends to Endor to kill the Jedi...