"You'll never be truly happy," were the words that haunted Barry Allen this season on The Flash, as he faced off against villains from another universe. Despite the hatred that he most likely felt towards Eobard Thawne, Barry found it in himself to forgive the man responsible for the misfortune in his life, only to have another close friend betray his trust, and open up the wound that was just beginning to heal.
During the final moments of "King Shark," it was revealed that Jay Garrick was in fact Zoom. Barry may have fallen for that trick during his first year as a superhero, but falling for it for a second time will lead Barry to a dark place.
While Zoom may currently be terrorizing the civilians of Earth-2, he won't be doing so for much longer. Barry has plans to somehow travel back to Earth-2, and put an end to Zoom's reign, but to do so, he must turn to an old foe.
In an effort to put an end to Zoom, Barry will seek the help of Eobard Thawne. He will not travel into the future for the Thawne he sent back, but rather to an earlier point in time, with the hopes of him increasing his speed.
As with all time travels, this trip won't exactly be a walk in the park. To avoid disrupting the timeline, Barry will have to pretend to be the trusting Barry that Thawne took advantage of, which makes matters difficult as he has to knowingly trust the man that killed his mother. Barry will also have to face off with one of his earlier foes, The Pied Piper, and to make matters worse, Barry will also have an encounter with an old friend, Eddie Thawne.
The last time we saw Eddie, he sacrificed his life to stop his descendent, Eobard, from killing Barry. It will be interesting to see how Barry interacts with Eddie, knowing that Eddie will inevitably die to protect him.
It's also worth noting that this episode will air a day after "Worlds Finest," the upcoming crossover episode between The CW's The Flash, and CBS' Supergirl. We know that the crossover will deal with The Flash being stranded on Supergirl's universe, which makes one wonder if Barry traveling to the past was intentional, or an accident.
The Flash returns on March 22 at 8 p.m. on The CW.
Should Barry kill Zoom, or should he incapacitate him?