3.4 The New Rogues (The Flash 2014)

Plot Summary
Sam Scudder emerges from a mirror where he was trapped for 3 years. He goes out to hunt for Leonard Snart while reuniting with Rosalind. Meanwhile, Barry and Iris have relationship issues where Barry feels uncomfortable kissing Iris in front of Joe. In Wells' situation, he recommends to the gang to find another Dr. Wells to support their team once he and Jesse head back home. For Jesse Quick, she kisses Wally who doesn't want to pursue a romantic relationship yet due to Jesse having to head back home.

When Flash and Jesse Quick take on Sam who is Mirror Master and Rosalind who is Top, Mirror Master traps Flash in a mirror. While Wells and Cisco have trouble making a device to slow down or cool the mirror to let Barry free, Caitlin secretly uses her ice powers to free Barry.

Once Barry and Jesse defeat Mirror Master and Top, the gang have a farewell for Dr. Wells and Jesse while welcoming the new Dr. Wells. Later that night, Caitlin starts to lose control of her powers and cannot hide signs of her transformation.