: Titled " Pandora’s Box ," this episode features the plan to finally open the bunker after six years, testing the loyalty of the grounders and Sky People.

: The episode highlights the contrast between traditional Viking raiding and Ivar’s more modern, calculated military leadership. 2. The Boys S5E4: "The Plan" (Projected/2026)

: The Boys and a team led by Homelander and Soldier Boy both converge on Fort Harmony to find "V1," a variant of Compound V that Homelander believes will grant him immortality.

: It is revealed that Soldier Boy is immune to the supe-killing virus due to the V1 in his veins. Homelander seeks this same power for himself.

: Bishop Heahmund and King Aethelwulf formulate a strategy to besiege the Vikings at York. They plan to starve the Vikings out rather than engage in a direct, bloody assault.

: Ivar the Boneless anticipates the Saxon siege. He demonstrates superior administrative and psychological warfare skills, rationing supplies and maintaining the morale of his professional warriors longer than the peasant-heavy Saxon levies.

In more recent media discussions (April 2026), there are reports and reviews for a fifth season of The Boys featuring an episode titled "The Plan" or revolving around a central mission to Fort Harmony.

Originally aired on December 13, 2017, this episode focuses on the escalating conflict between the sons of Ragnar Lothbrok and the Saxon forces.