SPOILER WARNING: This article contains major spoilers for "Best Laid Plans," the latest episode of Agents of S.H.I.E.L.D.

Alphonso "Mack" Mackenzie and Elena "Yo-Yo" Rodriguez may have won the battle, but they haven't won the war. In "Best Laid Plans," the latest episode of Agents of S.H.I.E.L.D., the two time-displaced agents got into a standoff with Kasius and his guards. Contrary to what Kasius believed, Mack and Yo-Yo's plan wasn't to stop him from detonating the bombs; they were only trying to stall him. Kasius played right into their plan, and they were able to seize victory -- but Kasius has some other tricks up his sleeve.

Speaking to CBR, Henry Simmons and Natalia Cordova-Buckley celebrated their characters' victory while warning of things yet to come. According to the two actors, Agents of S.H.I.E.L.D. fans should "definitely" be worried about Kasius and his seer. They also teased that not everyone will make it back to their proper time.

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CBR: When it comes to Mack and Yo-Yo's defeat of Kasius, was it as satisfying for you to play as it was to watch?

Cordova-Buckley: Yes!

Simmons: Yes, it was. I'll say because, again, we can just allude again to Dominic [Rains], what he was doing with the character of Kasius. It was satisfying in the fact to see him play that character and play him in a way where you see the weaknesses in that Kree being. But at the same time, you see how his ego and pride enhance that this man is so weak. It was interesting to see Dominic play those dualities. It was fun! And the little banter that Yo-Yo and I have beforehand is always nice. Again, it shows some of the conflict that we have in our relationship, in terms of "I want to do it this way" and "I want to do it that way," and that is real. That is real. That is how relationships happen between two mature people in a mature relationship and I love those little moments like that.

It looks like Coulson and the others are on a collision course with the Lighthouse. What can you tease about Mack and Yo-Yo's reunion with them?

Cordova-Buckley: How can we tease about something that we don't know if it happens?

Simmons: Yeah, there's an if!

Cordova-Buckley: We don't know if we make it back to the present.

Simmons: Look, let me tell you this: in any revolution, there is the possibility that you lose someone because that's the essence of war. So even if one makes it back, another might not. That's all I'll say.

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Kasius has his own seer in his pocket. How worried should that make us?

Cordova-Buckley: They should definitely be worried!

Simmons: Definitely! Yeah! If he has someone that can tell the future and tell him what to do and what not to do, that's scary, because this guy already thinks of himself as a god. That's frightening for someone with all the resources and power that he has at his fingertips, and here we are, human beings and humans just trying to survive. That's really frightening.

Airing Fridays at 9 p.m. ET/PT on ABC, Marvel’s Agents of S.H.I.E.L.D. Season 5 stars Clark Gregg, Ming-Na Wen, Chloe Bennet, Henry Simmons, Ian De Caestecker, Natalia Cordova-Buckley, Elizabeth Henstridge, Nick Blood, Jeff Ward, Eve Harlow, Pruitt Taylor Vince and Coy Stewart.