During last night's episode of The Flash, Zoom killed Danielle Panabaker's character. Now before you freak out, he killed Panabaker's Earth-2 doppelganger, Killer Frost. It was somewhat of a surprise that Zoom even kept her alive, considering his low-tolerance for failure.
However, with Caitlin Snow now his prisoner, Zoom had no additional sentimental reasons to keep Snow alive. Speaking on that development, executive producer Andrew Kreisberg stated, "We loved what Danielle did with her, so when we were designing this episode and we had Zoom kidnap Caitlin, it just seemed like a fun thing to do to be able to have the two of them together and to have Caitlin actually experience time with her. It gave us an opportunity to sort of deepen both characters. But ultimately, she had to go. [Laughs] No, I mean, like even [Frost] said, the only reason [Zoom] kept her alive, the only reason he had to keep her alive was she was a living remembrance of him caring about Caitlin."
Zoom (guest star Teddy Sears) arrives back on Earth-1 intent on taking over Central City. Barry (Grant Gustin) and Wells (Tom Cavanagh) come up with a plan to stop Zoom once and for all but it’s extremely dangerous. Unsure if he should take the risk, Barry reaches out to both fathers for advice. Henry (guest star John Wesley Shipps) is adamantly opposed to Barry risking his life again but Joe (Jesse L. Martin) thinks he can handle it which puts the two men at odds with each other. Meanwhile, Cisco (Carlos Valdes) is shocked when he vibes the Earth-2 villain Rupture, who happens to be his brother Dante’s (guest star Nicholas Gonzalez) doppelganger. Rupture came to this Earth seeking justice for Reverb’s death. Iris (Candice Patton) decides she’s finally ready to open up to Barry about her feelings for him. Armen V. Kevorkian directed the episode written by Kai Yu Wu & Lauren Certo.