The Man in the Yellow Suit

"The Man in the Yellow Suit" is the ninth episode of the first season of The Flash and the ninth episode overall. It aired on December 9, 2014.

Synopsis
Barry finds himself face-to-face with his nemesis, the man in the yellow suit, a.k.a. Reverse-Flash, who killed his mother. Barry is frustrated when the Reverse-Flash escapes, but Dr. Wells and Cisco come up with a plan to trap him. All they need is bait, so they turn to Dr. Tina McGee from Mercury Labs to help. Meanwhile, it’s Christmas at the West household and Iris is in full holiday cheer. Eddie gives her a surprising gift but also leaves her with a question that could change her life. Joe joins the search for the man in yellow and ends up in the crossfire. Caitlin finds Ronnie.

Plot
Barry races through the city chasing his mother's killer; the man in the yellow suit.

One Day Earlier Barry is decorating a Christmas tree with Joe when Iris come in with eggnog. While Joe takes a call from the DA in the next room, Iris convinces Barry to exchange gifts early. Barry gives her a replica of her mother's wedding ring; he lost the original in the fifth grade. Iris is touched. Eddie arrives and notices the exchange but says nothing.

Later Barry goes to Star Labs to give his new friends their gifts. Wells leaves abrubtly during the festivities and Cisco reminds Barry its now the anniversary of the explosion. Wells is in no mood to celebrate.

At jitters Eddie asks Iris if she believes Barry is in love with her. Iris denies it, despite the gift and allays his concerns. Eddie gives Iris a key to his apartment which she happily accepts.

At the mall parking lot, Caitlin notices she is being watched from the shadows by a homeless man. Following the man when he tries to flee, she corners him and he sprouts flames from his hands and head. The metahuman turns and reveals himself to be Ronnie. Shocked to se him she runs off allowing him to escape also.

At Mercury Labs serveral guards are killed by a fast yellow blur. The yellow blur appears to be looking for something and ransacks much of the lab.

Trivia

 * Cisco's shirt depicts the game rock-paper-scissors-lizard-Spock, a game invented by Sam Kass, and many times played by The Big Bang Theory 's  character, Sheldon Cooper. This is likely a reference to the show, because Sheldon is a huge fan of The Flash.
 * When he's being interrogated the man in yellow says, "I'm not like the Flash at all. Some would say I'm the reverse". This a reference to his DC comic book name, the Reverse-Flash.
 * Cisco mentions to Joe the possibility of two speedsters the night Nora Allen was murdered. This could be a possible reference to the existence of other Flashes in the DC multiverse, but also a hint on a possible future event, where Barry and the Reverse-Flash go back in time to that night together.
 * Harrison Wells is seen with the costume of Reverse-Flash in his star labs secret lair. He also bares a Flash Ring that he used as a key to acces his suit. In the DC comics it contains the Flash suit. Since Reverse-Flash and Harrison Wells where in the same room (with the first beating the latter) it is still unclear if Harrison is truly Reverse-Flash and if he is whether he used a decoy, or was actually face-to-face with himself thanks to time travel. Since Wells has been taking DNA samples from each captured metahuman encountered it is also possible that he used Multiplex genes to copy himself (However Multiplex died and wasn't captured, but Wells could've found the body and taken some of his genes).