Robbie Amell returns to The Flash in the February 9 episode.
Here’s the official description for “Welcome To Earth-2” from The CW.
BARRY VISITS EARTH-2 – Barry (Grant Gustin), Wells (Tom Cavanagh) and Cisco (Carlos Valdes) journey to Earth-2 to rescue Wells’ daughter, Jesse (guest star) from Zoom. Barry is stunned when he runs into Earth-2 Iris (Candice Patton) and Joe (Jesse L. Martin), but nothing prepares him for meeting Killer Frost (Danielle Panabaker) and Deathstorm (guest star Robbie Amell). Meanwhile, back on Earth-1, Jay (guest star Teddy Sears) has to take over the Flash’s responsibilities when a meta-human nicknamed Geomancer (guest star Adam Stafford) attacks Central City. Millicent Shelton directed the episode written by Greg Berlanti & Andrew Kreisberg and Katherine Walczak (#213). Original airdate 2/9/2016.