Better Call Saul spoilers follow.

This week, Better Call Saul finally delivered the epic crossover event that fans had been waiting for, with Breaking Bad stars Bryan Cranston and Aaron Paul returning to reprise their roles.

And now, the show's executive producer Tom Schnauz has opened up about how that crossover came to life in an interview with Entertainment Weekly.

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Talking about why now was the right time to bring the two iconic characters back into the spin-off, Schnauz said the conversations surrounding the topic had been happening since the inception of the show.

"We talked since season 1 about, 'When do we bring back Walt and Jesse? Do we bring back Walt and Jesse?'" he said.

bryan cranston as walter white, aaron paul as jesse pinkman   better call saul  season 6, episode 11
Greg Lewis/AMC/Sony Pictures Television

Related: Better Call Saul star responds to character’s future

"And now that Gene in Omaha is slipping back into his old ways, now felt like the right time to show the Saul Goodman character and the decisions he made chasing Walter White, the same way he made decisions to do these crazy Omaha scams.

"That's off of the Kim Wexler phone call, the mystery phone call that we don't know what happened yet. Something very upsetting happened on the other end of that line that brought back up a lot of old feelings and a lot of pain, and Jimmy McGill's drug of choice to numb that pain is Saul Goodman," he explained.

"And just like the events of [the episode 'Fun and Games'] — the death of Howard Hamlin (Patrick Fabian) and Kim keeping a secret about knowing that Lalo was still alive and not telling him, and the reasons that she didn't tell him caused a lot of pain and pushed him full Saul Goodman.

bob odenkirk as gene   better call saul  season 6, episode 11
Greg Lewis/AMC/Sony Pictures Television

Related: Better Call Saul star breaks down shock Lalo twist

"Something about that phone call brought up a lot of pain that he needed to cover up again, and he needed to get back into that world of taking advantage of other people," he added.

Bryan Cranston recently talked about the secrecy surrounding their roles on the show, revealing to Radio Times that it was "surreal".

"We were flown into New Mexico secretly and they created this shroud of privacy – we were sent right away to an Airbnb house that we were not allowed to leave. There was all this stuff going on, it was exciting! But also a secret and we kept it secret for a year," he said.

"And then when Better Call Saul premiered they announced it, and Aaron and I said: 'Oh, well, I guess we can talk about it now!'"

Better Call Saul airs on AMC in the US and on Netflix in the UK.

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Shivani Dubey is a freelance writer covering entertainment, culture, social trends and lifestyle. She has been published in Vice, Vogue India, Refinery29, Mashable, i-D, Little White Lies, HuffPost and The Daily Beast among other titles. You can find her on Twitter.