"The Flash" and "Arrow" crossover part 1 has been aired as scheduled. It turns out that the first episode of the crossover is absolutely interesting as a prequel to the upcoming new The CW's TV series, "Legends of Tomorrow."

According to Collider, its reporter had been invited together with some other press outlets to screen the crossover episodes of "The Flash" and "Arrow." After the screening, a Q & A followed, and the executive producers of The CW series were present to discuss the major events of "Legends of Tomorrow" prequel.

One of the many questions that were asked to executive producers Greg Berlanti, Marc Guggenheim and Andrew Kreisberg is how do they keep death impactful in the "Legends of Tomorrow?" Considering that there had been so many ways that key characters "had been brought back to life on 'The Flash' and 'Arrow,' whether it was through the Lazarus Pit, time travel or reincarnation?"

Marc Guggenheim, who first answered the question, said that the thing with Lazarus pit had been taken care of. In the new TV series, it would explain why "time travel can't be used in a deus ex machina way, and not just with respect to death, but with respect to any plot contrivance."

Greg Berlanti on the other hand pointed out that "Legends of Tomorrow" will be different from "The Flash" and "Arrow" shows because it's pretty much like the comic books. Certainly, there are characters in the series that would die, some others died for 20 years. However, Berlanti said that some dead characters they're really dead, though it doesn't mean that they stay dead forever. "If something comes to us that's a really cool, organic way to bring the character back and is exciting to us and doesn't devalue the death, but introduces them into the narrative in an interesting way, the genre that we're making is different from other shows, in that way."

For Andrew Kreisberg, the key to all the deaths that are about to happen in "Legends of Tomorrow" is the consequences of the actions or decisions that one has made. He cited an example like Sara and Thea in "Arrow" or when Barry altered the timeline, there were consequences that went after it. A price has to be paid, either instantly or at a later time.

Kreisberg also added that in the "Legends of Tomorrow" the real bad guy is not Vandal but it is time itself. "Time wants to go in one direction. When people die, the universe wants them to stay dead." Changing the course of history has a great price to be paid.

Forbes also says that what the showrunners explained during the Q&A with press was no lie. The two crossover episodes "got together for what truly is a movie event aired in two one-hour chunks over two nights." Both episodes are committed to establish the backstory of "Legends of Tomorrow."

Others may not be opened to the idea of using "The Flash" and "Arrow" as a springboard for "Legends of Tomorrow," but Forbes said that it was entertaining.

If you have watched the first installment of the crossover episodes of "The Flash" and "Arrow," how would you rate it? Share your verdict in the comment box below.