The Flash Season 2 Episode 13 Welcome to Earth-2

Barry, Cisco, and Harry use the Speed Cannon to travel to Earth-2, a parallel Earth that is similar to their own but with a few major differences. On Earth-2, Barry Allen is not The Flash but is a successful and wealthy forensic scientist. Meanwhile, Joe West is a lounge singer and Caitlin Snow is a villainous meta-human named Killer Frost. They also meet Earth-2's version of Harrison Wells, who is actually a renowned scientist and the superhero known as "The Revere."

As they explore this new world, they are tasked with finding the Earth-2 version of Zoom, who is terrorizing the city and has abducted Barry's doppelganger's daughter, Jesse Quick. Along the way, they encounter other familiar faces with different personalities and roles, including Laurel Lance as a meta-human vigilante known as "Black Siren," and Ronnie Raymond as a villainous meta-human known as "Deathstorm."

The team splits up to pursue various leads, with Barry and Cisco traveling to a familiar Star Labs to seek out Killer Frost, while Harry explains to Joe and Iris what they should do while they wait. However, things quickly go off the rails, forcing the team to improvise and adapt in order to complete their mission and save Jesse.

Welcome to Earth-2 is an exciting and action-packed episode that delivers on the promise of exploring alternate realities and doppelgangers. It's entertaining to see how the same characters we know and love can take on vastly different personas on another Earth, and the use of familiar faces like Laurel and Ronnie adds a layer of intrigue and nostalgia. The episode also sets up future storylines and character developments by hinting at the bigger picture of the multiverse and the potential dangers that may lie ahead. Overall, it's a thrilling ride that keeps viewers on the edge of their seat.