“Lose Yourself” starts with Barry and Ralph scanning the bus the Dark Matter hit. The duo has a quick argument on whether or not they’re going to kill DeVoe, with Barry refusing the kill the villain with Ralph wanting to kill him.
Barry gets a text on his phone, Wells has called them back to STAR Labs because he’s made a breakthrough in defeating DeVoe. Wells has made a device — a Sonic Scepter — that uses soundwaves to render DeVoe’s powers useless.
Joe notices Wells becoming particularly attached to his new thinking cap and points it out to Cisco.
Caitlin’s working on the science behind herself turning into Killer Frost. She reveals to Iris that the powers are caused by her adrenal glands so that if she shoots herself with an epinephrine pen, she’ll instantly turn into her alter ego.
An alert begins going off, alerting the group that The Thinker has used his powers. When Barry, Cisco, Ralph, and Caitlin arrive at the location of the alert, they run into the final bus meta — Edwin Gauss a.k.a. Folded Man.
They find out that Gauss can make pocket dimensions, much like how DeVoe’s able to travel.
Joe pulls Wells aside to talk to him about the thinking cap. Joe mentions that Wells is beginning to show addictive tendencies and Wells does his best to convince Joe otherwise. After Joe leaves, Wells enters the secret room we’ve previously seen him use. Joe catches him entering the room.
Barry, Ralph, and Caitlin visit a hippie commune in an attempt to find Gauss. After asking around, Caitlin finds him, which leads to a pursuit. Barry and Ralph are able to stop Gauss but as they’re talking to him, a samuroid sneaks up behind Caitlin and stabs her through her chest.
The team rushes back to STAR Labs where Caitlin’s able to begin recuperating. There, we find out that Gauss has agreed to stay in the pipeline in an attempt to keep him safe from DeVoe.
Ralph’s talking to Gauss in the pipeline when the new meta-human starts telling Dibny stories about his traveling between pocket dimensions. Gauss tells Dibny that he’s been to a pocket dimension with one of the ninja robots, as he calls them, and…
