Harbor District Attack
Barry heads to where a giant monster is attacking the harbor district and helps Iris save some people from a bus in episode 3x05 “Monster”.
Fourth & Aspen
Cisco uses a portal to bring J'onn ahead to ambush the Music Meister in episode 3x17 “Duet”. Wally, Cisco, and Joe arrive downtown and find a flying samurai terrorizing the city in episode 4x01 “The Flash Reborn”.
Wormhole on Ninth
Barry and Wally exit a wormhole to confront Kadabra. Later Barry rips him from his time ship and hands him over to Cynthia Reynolds in episode 3x18 “Abra Kadabra”.
Rebecca Sharpe breaks her high heel running for the bus after losing her job in episode 4x03 “Luck Be a Lady”.
Near the Hellmouth
Barry and Ralph spot the portal they need to use to escape in the distance but are stopped by DeVoe in episode 4x23 “We Are the Flash”.
Raya Van Zandt races down the street in her stolen car away from the police in episode 5x10 “The Flash & The Furious”.