: 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.
: 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)
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.
: S5E4 involves Joe Goldberg’s elaborate plan to replace a character named Reagan with a double named Maddie to manipulate his wife, Kate. 'Vikings' Season 5, Episode 4 Review: 'The Plan' - Forbes