Doppelgängers Season

So first was Katherine who we heard an entire season about ,till she decide to show up and mess Mystic Falls around, then it was Bolivia who exchanged verses and passed by the original Olivia, now we have two twins exchanging lives, Bridget and Siobhan, and hey we have two more even If I don't watch the Lying Game I know enough to tell that Emma and Sutton are twins.

Now making my point, is Doppelgänger season and we all know it. Ok maybe in some cases not in the complete sense of the word, but let's just stick to the simple sense of the word, that being, a double or a look-alike of a person.

So when the Doppelgänger landed at the Vampire Diaries, it was just Elena, learning that Katherine ,the love of Salvatore's life looked just like her, and by some unexplained reason the girls were linked, then to Katherine be actually alive ( it's vampire world here, go for the 100's of years), and that she back to mess with everybody's life, but not before trying to pass by Elena and succeeding a couple of times, she isn't gone for good, but the trick remains straight hair = Elena, curly=Katherine, except when Katherine is trying her charms on the Salvatore brothers.

Then Fringe just pushed the boundaries , and hey parallel worlds where the same people that lived in the normal world had different choices over there, and entire cast with double characters Olivia -Bolivia, Walter- Walternate… ow except Peter (remember 1st Peter died), till they exchange Olivias between verses, and then is Doppelgänger season cos she had everybody fooled for quite a long time, while original Olivia was stuck over there. Now everybody is back to their verses and normal hair colors, but aware of their doubles and even working together.

Now we have estranged sisters coming together , in double doses, honestly CW (Ringer) and Abc family (The Lying Game) launching series with very similar ideas at the same time but clearly to different audiences (so weird) . Ok will focus on "Ringer" that Im actually watching.

Well at this point we have more information about Bridget than about Siobhan, making the audience have more empathy for Bridget.

Summing up the story ,basically both sisters get in touch after a long time without talking to each other, an accident happens and Bridget takes Siobhan life,believing that she is dead. While Siobhan goes to Paris and who knows what are her plans, anyway Doppelgänger is in place, and no super different hair to help here this time is about places ,at least for now, USA = Bridget, Paris= Siobhan.

So not the first time Doppelgängers appear in series, and is extremely common in Mexican soap operas (Maria del Barrio, Usurpadora…) in Buffy The Vampire Slayer they appeared quite a few times, Willow and Vamp Willow in Doppelgangland is a classic one, but then we had a Xander episode too, and even a Buffy Bot, well but that was a robot so it doesn't count.

Anyway Doppelgängers have been around for a long time, they tend to cause quite a mess when they appear, as an audience I love to see the actors in question playing a different character in the same series, it must be a challenge, but Im under the impression they love.

I know nowadays it must be easier in terms of production nonetheless still tricky every time both characters are in the same scene.

So who is you favorite Doppelgänger?