Clues: Welcome to Madripoor, There’s a New Serum Out There and Who’s The Power Broker?
We also get a glimpse into Walker’s mental state and frustration over a lack of leads regarding the anti-patriotism group.
In an effort to learn more information on the serum, Zemo offers to trade Bucky for it, learning that it’s being developed by a scientist named Dr. Wilfred Nagel for the Power Broker.
Though unaware of her location, he does reveal she called for help with Donya’s health, but was unable to.