Barry saves Oliver and Diggle from a hail of bullets shot by the Vigilante in episode 3x08 "Invasion!".
Barry heads to a hotel to stop Plunder but is almost killed by Plunder's gun before he is saved by Wally in episode 3x10 "Borrowing Problems from the Future".
Barry attempts to thwart a burglary but freezes when he recognizes the criminal from his time in the future in episode 3x10 "Borrowing Problems from the Future".
Barry and Wally team up to stop Plunder when he robs the jewel exhibit at the museum in episode 3x10 "Borrowing Problems from the Future".
Barry and Joe sit in the car across the street from the Jitters in episode 3x20 "I Know Who You Are".
Caitlin talks to Savitar after failing to kill Tracy Brand at the university in episode 3x20 "I Know Who You Are".
Rebecca Sharpe uses her powers to steal from a bank and Barry is not so lucking in stopping her in episode 4x03 "Luck Be a Lady".
Philip attends an addiction support group and meets another Traveler who was sent to help him in episode 2x02 "Protocol 4". Philip has a vision of another timeline while at his addiction support meeting in episode 2x09 "Update".
A team of Travelers are interrogated in the basement of an old building in episode 2x03 "Jacob".
Carly and Marcy go up to the roof of a building that is being renovated and they see Galston Agriculture explode in episode 2x04 "11:27".
Walt gathers a group of National Guard soldiers in front of the Quantum Frame in episode 2x05 "Jenny". Traveler 0029 takes Marcy to the room with the Quantum Frame only to find it filled with dead Fraction members in episode 2x08 "Traveler 0027".
Philip slips the anti-viral into a water bottle at the gym in episode 2x05 "Jenny".
Blair is attending a rave when the Faction uses the Quantum Frame to take over most of the attendees in episode 2x08 "Traveler 0027".
Carly defends the restaurant from a adjacent rooftop in episode 2x10 "21C".
The team tracks the phones down to an empty building but find that Vincent anticipated them in episode 2x12 "001".
Simon works on the Traveler's network in the early days and believes he hears the police arriving in episode 2x11 "Simon".
Umber takes Quentin to the pocket universe he is working on and asks Q what he thinks of the world in episode 2x13 "We Have Brought You Little Cakes".
Julia and Quentin find the book without an author based on Eliot's hint in episode 3x01 "The Tales of the Seven Keys".
The gang finds Professor Lipson on the edge of the roof preparing to jump and Quentin tries to talk her down in episode 3x02 "Heroes and Morons".
Shaun and Claire catch a helicopter down to San Francisco to pick up the organ for transplant in episode 1x03 "Oliver".
Shaun and Claire head outside to catch their helicopter back but their flight is grounded by the fog in episode 1x03 "Oliver".
Thea and Oliver chase the thief across the rooftop but he escapes when Thea passes out in episode 4x12 "Unchained".
Lance searches through the abandoned building which begins to explode around him in episode 4x14 "Code of Silence".
Team Arrow tracks down the group that almost killed Lance and attack their base only to have it explode too in episode 4x14 "Code of Silence".
Oliver and Diggle head to the facility only to find the Demolition Team has gotten there first in episode 4x14 "Code of Silence".
Felicity tries to walk using the new implant with Paul's help in episode 4x15 "Taken".
Oliver and Diggle stand on a rooftop while Vixen flies overhead searching for William in episode 4x15 "Taken".
Oliver flies down to the hotel where Darhk is holding William in episode 4x15 "Taken".
Vixen is fighting several criminals when Oliver arrives to recruit her in episode 4x15 "Taken".
The team follows the clue left in Curtis to one of Oliver's old targets back during his days as the Hood and Evelyn reveals her true loyalties in episode 5x09 "What We Leave Behind".
Oliver heads to the offices of the company he assaulted four years ago and finds the building staged like the aftermath of his attack by Prometheus in episode 5x09 "What We Leave Behind".
Tina and the crew work together to take out the drug dealer who killed her partner in episode 5x11 "Second Chances".
Oliver is hosting a food drive for Thanksgiving when Agent Watson arrives with some agents to arrest him in episode 6x07 "Thanksgiving".
Oliver heads to the machine room only to discover that the bomb is a fake planted by Cayden James to draw him out in episode 6x07 "Thanksgiving".
The evil soldiers from Earth-X assemble in an abandoned shipping facility where the team tracks them down in episode 6x08 "Crisis on Earth-X, Part 2".
The team watches footage of the troops from Earth-X raiding a lab in episode 6x08 "Crisis on Earth-X, Part 2".
Felicity shows Oliver the doctored footage of the death of Cayden James's son in episode 6x12 "All for Nothing". The team recovers the original footage revealing the true murderer in episode 6x13 "The Devil's Greatest Trick".
Cayden James lets his allies that they will airlifted out of the city before his countdown comes at midnight in episode 6x13 "The Devil's Greatest Trick".
Anatoly is attempting to escape the city in a helicopter when Oliver shows up to stop him in episode 6x13 "The Devil's Greatest Trick".
Dinah tracks Black Siren while she is recovering the supplies needed to flee town in episode 6x13 "The Devil's Greatest Trick".
Liv has a vision of the Coyote burning something in an incinerator and later she and Clive track down the location and find it filled with old bones in episode 4x03 "Brainless In Seattle, Part 1". Ravi acts as bait to draw out Bruce Holtz and then Liv tries to arrange another meet-cute and Michelle in episode 4x04 "Brainless in Seattle, Part 2".
While Clive and Liv are investigating the zombie battle royale Liv spots Major in the audience with Roche in episode 4x08 "Chivalry is Dead".
Stacey Boss and Blaine go to the locker looking for Boss's stolen money but find it empty in episode 4x08 "Chivalry is Dead".
Sara, Rip, and the new Green Arrow catch their breath in a warehouse after escaping Deathstroke in episode 1x06 "Star City 2046".
Connor, Sara, and Rip search the Smoak Technologies warehouse for the part they need to fix the ship in episode 1x06 "Star City 2046".
The teams assemble on a roof near S.T.A.R. Labs to fight the first wave of Dominators and plant the devices created by Stein and his daughter in episode 2x07 "Invasion!".
Lena is taking off in her helicopter when it is attacked by several drones in episode 2x01 "The Adventures of Supergirl".
Supergirl fixes the support to prevent the L Corp building from falling over in episode 2x01 "The Adventures of Supergirl".
Supergirl and Superman help the firefighters put out a building that is on fire in episode 2x02 "The Last Children of Krypton".
Clark lands back in Metropolis and quickly receives a call from his boss in episode 2x02 "The Last Children of Krypton".
Axel holds out in the hospital defending the Doc and the unconscious Vanessa in episode 1x01 "Help Me".
Source: YVRShoots — Twitter
Vanessa is captured by Julius and forced to fight her old friend Susan before escaping in episode 1x05 "Fear Her".
Mohamed shoots off flares to warn the group back at the hospital and then watches them flee in an ambulance in episode 1x07 "For Me".
Kovaks thinks about past battles after the firefight in the lobby in episode 1x01 "Out of the Past".
Ortega wakes up in the morning and asks her tracking program to inform her if Kovaks moves in episode 1x02 "Fallen Angel". Ortega brings her grandmother home in a borrowed sleeve to celebrate Día de los Muertos with the rest of the family in episode 1x04 "Force of Evil". Kovacs reveals to Ortega that the duplicate body survived in episode 1x10 "The Killers".
Ortega trains aggressively with Aboud in the morning before work in episode 1x02 "Fallen Angel". Kovaks chases the elevator down to save Ortega after spotting the Ghostwalker posing as a police officer in episode 1x05 "The Wrong Man". Prescott demands the release of Bancroft's clone while the attack from the day before is still being cleaned up in episode 1x06 "Man with My Face".
Ortega and Kovaks follow up on a tip from Poe and find footage of Laurens Bancroft assaulting his son on the night of his murder in episode 1x05 "The Wrong Man". Dimi is needlecast into the Kovaks clone and later the real Kovacs and Ortega are kidnapped for a fight in episode 1x06 "Man with My Face".
Kovacs has to use his credit to get Ortega into the hospital when her own is insufficient in episode 1x06 "Man with My Face".