SPOILER WARNING: This article contains spoilers for "The New Rogues," the latest episode of "The Flash."

Jesse Quick isn't the only new metahuman in town. Over the first few episodes of "The Flash," Caitlin Snow struggled to keep her abilities in check when she was around her friends, but she may not be able to do so for much longer. At the end of "The New Rogues," the latest episode, she began to undergo a transformation that makes her look a whole lot like Earth-2's Killer Frost.

As the episode wound down, it cut to Caitlin coming home after a long day at STAR Labs. While she was showering, she inadvertently caused the water around her to freeze. Startled, she ran out of the bathroom and caught a glimpse of herself in the mirror. To her horror, she realized her lips had turned blue; what's more, there was a streak of white in her hair, which she took scissors to immediately. It is unclear whether or not this transformation has to do with the fact that she used her abilities to free Barry from a mirror earlier in the episode.

Before Caitlin came to struggle with her abilities, she helped Cisco and Harrison Wells track down another world's version of Harrison to take his place when he returned to Earth-2 with Jesse. After encountering Wild West and steampunk versions of him, they settled on a doppelganger who appeared to have a sense of humor. However, Earth-2's Harrison balked and said this Earth-19 version went against his gut. Nevertheless, Cisco pulled Earth-19's Harrison through -- but Earth-2's Wells might be right about him. In the preview for "Monster," the next episode, Earth-19's Harrison appears to have a few ulterior motives.

Starring Grant Gustin as the Scarlet Speedster, "The Flash" airs Tuesdays at 8 pm ET/PT on The CW. The series also stars Jesse L. Martin, Tom Cavanagh, Carlos Valdes, Candice Patton, Danielle Panabaker, Keiynan Lonsdale and more.