<P> The Enchanted Forest events happen after "We Are Both" and before "Quite a Common Fairy". The Storybrooke events happen after "Broken (Once Upon a Time)". </P> <P> In the Enchanted Forest, Rumplestiltskin (Robert Carlyle) is preparing to teach Regina (Lana Parrilla) everything she needs to know about magic . It is not as easy as it seems, especially after she struggles to take the heart out of a unicorn . She protests over doing this, but he tells Regina, "Nothing is innocent," before taking the unicorn's heart out himself . He also tells her not even magic will bring her fiancé Daniel (Noah Bean) back to life . The Mad Hatter / Jefferson (Sebastian Stan) later arrives to overhear the two and shows off a crystal ball that Rumplestiltskin has requested . Rumplestiltskin, however, had told the Mad Hatter that he actually needs "the slippers" to enter a realm with no magic, since the Mad Hatter's hat can only travel between realms with magic . Now that they meet for the first time, Jefferson tells Regina he has heard of a "wizard" who can help her bring back Daniel . They travel to see this person, who prefers to be called a doctor . As he examines Daniel's body, the doctor tells Regina that he is an ideal candidate for his "experimental" procedure, though, he still needs an enchanted heart, as normal ones cannot withstand the procedure . Regina lets him pick one from Cora's vault of living hearts . That night, the doctor begins his work on restoring Daniel to life, but announces his failure . This devastates Regina, who returns to being Rumplestiltskin's pupil and demonstrates her readiness by ripping the heart out of his new protegée, crushing it to prove her advancement . It is revealed that Rumplestiltskin was actually in league with the doctor, who exchanged the strong heart for the "monster" he got in Regina, and the Mad Hatter, who allowed him safe passage back to his world, the Land Without Color . Before departing, Rumplestiltskin and the Mad Hatter scoff at the doctor's claims that science is more powerful than magic . Rumplestiltskin bets that the doctor will one day see things his way, much to the doctor's doubts . </P> <P> It is later revealed that the doctor took the strong heart Regina gave him back to his laboratory, where he hands over the prized possession to his assistant and places it inside the body of the doctor's dead brother so he can bring him back to life . The doctor is revealed to be none other than Victor Frankenstein (David Anders), and that he relies on science, not magic . </P> <P> As Emma Swan (Jennifer Morrison), Snow White / Mary Margaret (Ginnifer Goodwin), Mulan (Jamie Chung) and Aurora (Sarah Bolger) return to the island from the castle, the foursome discover that everyone at the camp has been killed and their hearts ripped out by Cora . However, they discover Captain Hook / Killian Jones (Colin O'Donoghue) hiding among the bodies . Hook claims that he was the only survivor and pretends to act like a traumatized victim in an effort to gain their trust . However, Emma is suspicious of his claim, and is convinced that he is lying about the attack . She ties him to a tree and threatens to leave him to the ogres if he does not confess; Hook finally comes clean and reveals his identity along with Cora's plans to travel to Storybrooke . Hook then tells the four women that Cora is searching for an enchanted compass that he will help them find, so they could get back to Storybrooke if they take him back with them . Emma asks him why, and Hook reveals that it is so he can kill Rumplestiltskin . While Snow senses that Hook is using this plan to throw them off, Emma is aware of Hook's deception, knowing that as long as they don't trust him, they won't be surprised if he double - crosses them . The five individuals then prepare for their quest to search for the compass, which happens to be located at the top of an enormous beanstalk . </P>

Who is the doctor from once upon a time