The marine-turned-terrorist (played by Damian Lewis) came close to detonating an explosive vest that would have killed him and the US vice-president in the Showtime drama's first season, but ultimately did not go through with the attack.
"I think at the beginning of the year, we talked a lot about Brody expiring by the end of the [first] season," Alex Gansa told HitFix. "But as the season progressed, and as we saw Damian's performance, and as we saw the chemistry between Damian and Claire [Danes], we realised that we would be sacrificing a huge part of the show by having that vest work at the end of season.
"I would say I think we knew by the third or fourth episode that Brody probably would survive the season at that point, just because that doomed romance was so charged."
Gansa added that there is "more to tell in that doomed romance between these two characters".
"That's ultimately what convinced us," he explained. "By Brody blowing himself up in the last episode of the first season, it would have brought that particular story to a close, but ultimately Brody would be dead, Carrie (Danes) would have known she was right and that would have been the end of that.
"Now you still have this whole sequence to play in which Carrie is going to come to understand that she was actually correct about this guy. And what does that mean for her emotional connection to him and how is that going to play out? It felt like a very natural chapter two to that story."
> Claire Danes on Homeland season two: 'Things get intense'
> Homeland Claire Danes: 'I needed a break from crazy Carrie'
Co-showrunner Howard Gordon also revealed that the second season of Homeland is "connected" to a potential third season's story arc.
"We knew that there was so much story left to tell between Brody and Carrie," he said. "The real question was not so much about season two, but what about season three? The two are connected, so that's what we talked about."
Homeland returns to Showtime in the US from September 30. In the UK, Channel 4 will air season two from October 7.
Watch Howard Gordon discuss Homeland season two with Digital Spy below: