First up after we discovered that Zoom was another Jay Garrick who in this case is Hunter Zolomon from Earth 2 and while the explanation to this controversy is still a mystery the most obvious answer to how Zoom would end up looking like the Flash that he killed in front of Barry and his team is that Zoom and the Crimson Comet Flash are most likely clones to the man in the iron mask who has got to be the real one. Surely when Barry discovers Zoom's identity he will be devastated before he realizes that the iron mask prisoner is the real Jay Garrick who created him and the clone that mentored the scarlet speedster. Surely if Zoom does make it back to Earth 1 he will kill off one of Barry's friends in Central City to make him suffer and because Zoom cannot be stopped easily by a normal human being and knowing how Barry is afraid to go through the same trauma the Reverse Flash had put him through murdering his mother and framing his father for her death that of Zoom goes after any of them and threatens to kill them, Barry will and hopefully kill the evil speed demon by phasing his hand through his heart at the right frequency just like Zoom and Eobard killed some of their victims in previous episodes of the show but whether Barry will travel back to Earth 2 on his own or not to stop him is yet to be revealed
Now for Caitlyn Snow, from her debut in the Arrowverse, her earth 1 self was a normal person working at Star Labs and while she has not been exposed to the dark matter unleashed from the particle excellerator explosion, her double on Earth 2 has and despite having started out with her powers as a supervillain, Killer Frost eventually reformed herself by stopping Zoom from killing Jesse by freezing him giving Team Flash enough time to escape and while Killer Frost's fate has not been revealed yet, chances are that she is still alive as Zoom must have plans for her and seeing how big a deal it is for Caitlyn on Earth 1 to be sure that she will never become like her Earth 2 double, it makes the chances of her becoming Killer Frost in the future even greater and maybe even sooner if Zoom makes it back to Earth 1 and when he does he would either kill Caitlyn to make Barry suffer or abduct her, inflict her with trauma before he injects her with her doppleganger's metahuman genes to make her Killer Frost but sometime later when the final 8 episodes of season 2 arrive we will find out for sure on how Earth 1 Caitlyn's fate will turn out
Now with the Grant Gustin's Flash crossing over into Supergirl after CBS and CNW fulfilled their contract in support of Barry Allen's exploration through the multiverse there is a slight chance that Bruno Heller, executive producer of Gotham will kindly allow CNW and FOX to approve the Flash's multiversal crossover into the Gotham television series to help Detective Jim Gordon stop Azrael (Theo Galavan) from terrorizing Gotham City and help and Barbara Kean put their differences and reunite as the couple they were since the beginning of the show. The best time for this crossover to happen is in the season two finale but whether this will happen or not is up to Heller and the people of Arrow and Flash to decide
and finally Siobhan Smythe played by Italia Ricci publically known today as the fiance of Firestorm actor Robbie Amell. Having made her debut in Supergirl episode 14, Siobhan starts out as a confident employee working as Cat Grant's new assistant rivaling Kara. Next episode titled Solitude, she starts losing her confidence in her job when she hands Cat a package unopened and then when Winn notices her having trouble with his copy machine, she tells him about her father's affair and guilt over it and threatens him not to tell anyone about it and then at the end when Winn tells her that he has issues with his father she then falls in love with him but threatens him not to tell anyone about their relationship. This love scene from Solitude teases what will aggravate Siobhan into antagonizing Supergirl as the villainess Silver Banshee and the answer is a heartbreak. While it is unclear if Siobhan has already went through her transformation as the supernatural villainess or not due to her threatening Winn that she'll kill him he told anyone about her personal life we'll be sure to find out in the next three episodes soon enough before the crossover premiers on March 28th.