"Supergirl" season 3 is set to return on October 9 with plenty of plots to address. Included will be the next step for Alex Danvers (Chyler Leigh) and Maggie Sawyer (Floriana Lima). To recall, Alex proposed marriage to Maggie in the season finale of the second season.

"Supergirl" fans would have loved to see a marriage between the two. But that possibility went kaput with Lima reportedly opting to move on with her career, Executive Producer Andrew Kreisberg said in an interview with Entertainment Weekly. That meant Lima would no longer be a regular, putting her character in a questionable predicament.

Tearing down an emotional storyline

There were plenty of speculations on how the Sanvers' relationship would turn out.

That included seeing the marriage push through despite Lima not being a regular.

The other possibility was either seeing Maggie die or nixing the suggested marriage altogether. Aware that many “Supergirl” fans will be upset, Kreisberg was pretty careful on how to properly end the romance.

The shift starts in episode 3

A new character will be introduced in the third episode. Carlos Bernard will be taking on the role of Maggie Sawyer’s father. He is likely to gain the ire of "Sanvers" fans.

It remains unclear how Maggie's dad will break up the relationship. But according to Comicbook.com, Maggie will be put in a difficult situation. Could the father be against the marriage or tied up to another storyline (i.e. associated with villains) that places Maggie and Alex in a delicate situation?

Whatever Kreisberg and company have planned, it seems that viewers will be in for an emotional and tear-jerking climax for Sanvers.

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Take note however that Maggie Sawyers will not die, leaving the door open for a reconciliation or even marriage in the future.

Stronger bonds between Danvers

With Alex headed for a heartbreak of her own, the Danvers sisters will end up dealing with heartbreaks this third season. Kara/ Supergirl (Melissa Benoist) is still reeling from the departure of Mon-El (Chris Wood) and likely needs her sister more than ever.

With the Sanvers romance in turmoil, Alex will need Kara as well. With their personal lives taking a turn, the Danvers sisters will likely end up focusing on fending off the evil together - the same way they did back in the first season. This Danvers-centric shift seems to be one of the focuses of Kreisberg, something that is likely to be carried over to crossover shows like “Arrow,” “Flash” and “DC’s Legends of Tomorrow.” "Supergirl" returns for its third season this Monday, Oct. 9, on The CW.