They've been enemies for a long time, and now, their battle could become a significantly more personal one on Days of Our Lives.  

Theresa Is Finally Reunited With Her Son

Victor (John Aniston) and Stefano (Joseph Mascolo) have been the heads of the two most powerful families in Salem for years, and though they've mostly kept a truce in terms of the tricks they play on one another lately (and even teamed up to oust Kate--Lauren Koslow--from DiMera Enterprises), things could change now that Stefano has lost another child with Kristen's (Eileen Davidson) death.

His older son, EJ, was gunned down in cold blood less than a year ago, and Stefano was never able to exact revenge because there was never a way to track down who was responsible. Now, he is in mourning over his daughter as well, but he will learn very quickly that this time, he can get revenge, with Victor's family members having full responsibility over what happened.

Mel and Brady Find Themselves In Grave Danger At Kristen's Castle

Kristen had kidnapped the embryo for Theresa (Jen Lilley) and Brady's (Eric Martsolf) baby before she left Salem, and thanks to Melanie's (Molly Burnett) digging, the truth came out. All three were at Kristen's castle and on the verge of being killed by her goons when Marlena (Deirdre Evans) arrived, mistakenly thinking that the address she found on Victor's desk would lead her to Paul (Christopher Sean) and John (Drake Hogestyn). When she arrived, the long battle she's had with Kristen resurfaced, and the two women began to fight. The altercation ended after Marlena flung Kristen away from her too hard--sending her toppling through the window and 100 feet below into the bay.

Now, because Brady is Victor's grandson, and Marlena showed up at the castle because Victor left the address in the place he was supposed to have kept Paul's--which indirectly led to Kristen's death. Now, Stefano may seek revenge on Victor for the death of his only daughter.

Days of Our Lives airs Monday-Friday at 1 p.m. on NBC.

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