WARNING: Major SPOILERS from Supergirl season 5, episode 9 "Crisis on Infinite Earths: Part 1."

Crisis on Infinite Earths fulfilled one of its main promises as the hero who founded the Arrowverse took part in his final adventure: Oliver Queen aka the Green Arrow (Stephen Amell) died. As revealed in the Arrow season 7 finale, the Monitor (LaMonica Garrett) revealed to the Emerald Archer that he had seen Oliver's death during the Crisis. But the first hour of the crossover had Amell's character be killed off differently than what the Monitor had seen. The choice of killing off Oliver right from the start was a shocker to many fans who tuned in with four more parts remaining.

But before Oliver made his heroic sacrifice, the Arrowverse lead passed on the mantle of the Green Arrow to his daughter Mia (Kat McNamara). This set her on the path that will be continued in the upcoming Green Arrow and the Canaries spin-off series. Oliver was, in many ways, seen as the leader of The CW's version of the Justice League, given that Arrow began Greg Berlanti's massive DC TV universe.

Related: Crisis On Infinite Earths Confirms Titans, Batman 66 & 89 As Arrowverse Canon

During a screening of the first two hours of Crisis on Infinite Earths, CBR took part in a Q&A with the executive producers of all the Arrowverse series. When asked about what inspired the writers to kill off Oliver this soon in the five-hour event, Marc Guggenheim stated that it was to defy viewers' expectations. Given that the Arrow season 7 finale had already confirmed Oliver's death, the writers wanted to be a step ahead of the fans who presuming that Oliver would bite the dust in the later parts of the crossover.

It really came off of [last season's crossover] Elseworlds, which strongly suggested that Oliver was going to die and then the Arrow seventh season finale, where we told the audience Oliver’s going to die in Crisis. So the dilemma that we presented to our own selves was that we spoiled our own story. So if Oliver dying isn’t the surprise, what is the surprise? And the timing of him dying [was the solution] because I think… we’ve kind of figured the audience is expecting that Oliver would die in the climax in the fifth hour, so if we went in the exact opposite direction and killed him off at the end of hour one we accomplish two things: hopefully we do surprise the audience, that’s absolutely the intention, but we also really establish the stakes, that going into the next four hours, ‘Wow, if Oliver Queen can die, then no one is safe.’

The Q&A also had fellow Arrowverse showrunner address that Oliver's death would hit the characters in heavy respective ways that will carry throughout the rest of the crossover. With the exception of Mia and White Canary (Caity Lotz), none of the Arrow characters were present as Oliver passed away. The upcoming installments will definitely see long-time characters such as John Diggle (David Ramsey) reacting to the Green Arrow's death.

The crossover will next continue on Batwoman tonight followed by The Flash tomorrow night. After part 3, the crossover is going on a break until Tuesday, January 14, 2020, when Arrow and Legends of Tomorrow will finish off the massive storyline. The event still have appearances by Smallville star Tom Welling as Clark Kent aka Superman and Kevin Conroy as a Kingdom Come-inspired Bruce Wayne, to name a few coming up on Crisis on Infinite Earths.

NEXT: Crisis On Infinite Earths Destroys Supergirl's World

Source: CBR