Season 03, Episode 08 – “Invasion!”
A superhero crossover event continues with aliens attacking Central City and Barry asking the Green Arrow for help to stop them. But they soon realize the battle is bigger than they thought, so they track down the Legends of Tomorrow and Supergirl to help. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust.
Season 08, Episode 10 “Sirens”
A new lead in the ongoing mole investigation is uncovered after two men disguised as sheriff’s deputies are killed in front of Callen’s home by an unknown female assailant. Meanwhile, Nell visits a prison to interview an inmate who is withholding information on the department’s leak.
Season 03, Episode 11 – “Mad City: Beware the Green-Eyed Monster”
The virus spreads through Gotham; and the laboratory that’s working on a cure is compromised. In other events, Mario and Gordon square off before the wedding; Selina meets an unexpected face; and Barbara has information about Isabella for Nygma.
Season 05, Episode 08 – “Invasion!”
A superhero event continues with Oliver waking up to a life where he never got on the Queen’s Gambit. Also, Robert and Moira Queen are alive and well, and Laurel is his loving fiancée and their wedding is imminent. Everything seems perfect, but Oliver starts to notice small imperfections that make him question this new reality. Meanwhile, Felicity and the recruits take on a new threat with help from the Flash and Supergirl.