Barry goes to stop a high-rise fire where Captain Singh's finance is trapped in episode 1x20 "The Trap".
Dr. Wells reveals that he has known about their plans all along in episode 1x20 "The Trap".
Geomancer goes on the news and calls out Jay Garrick and then brings down a building in episode 2x14 "Escape from Earth-2".
Jesse and Wally stop a bank robbery while Barry is away in episode 3x13 "Attack on Gorilla City".
Oliver goes to meet Moira in front of their company headquarters when she is shot at by a mysterious individual in episode 1x07 "Muse of Fire". Museo and Oliver see Thea outside the building in episode 3x14 "The Return".
Count Vertigo is being transported from the courthouse when his guard is injected with vertigo and begins shooting at press in episode 3x13 "Canaries".
Laurel talks with the others on the phone from Starling City in episode 3x03 "Corto Maltese".
Oliver and Diggle investigate an old Queen Consolidated subsidiary linked to the body in episode 5x21 "Honor Thy Fathers".
Philip is leaving a building when he spots Detective Gower waiting for him in episode 1x01 "Travelers".