In "Fast Lane," the next episode of "The Flash," Wally West has his first encounter with the Flash after Iris grows concerned over her brother's drag racing hobby. Meanwhile, Barry helps Wells try and figure out a way to seal the breaches between worlds.
According to the official episode description, "Barry (Grant Gustin) teams up with Wells (Tom Cavanagh) to figure out a way to close the breaches, but they are distracted by a meta-human nicknamed Tar Pit (guest star Marco Grazzini) who can transform into liquid asphalt. Iris (Candice Patton) is concerned for Wally's (Keiynan Lonsdale) safety after she finds out about his drag racing hobby. When he refuses to stop she makes a bold move that puts her in danger."