Production is about to begin on untitled Captain America 3 in April, and a draft of the script is already in the hands of the directing-duo The Russo Brothers. The two have giving hints to what expect from the third installment, while keeping tight-lipped as part of the usual business of working for Marvel Studios. I have a few ideas of who the villains should be, and a bit of the direction of the film.
Let's get this out of the way first, the Russo Brothers have all but confirmed the return of Rumlow (Crossbones) and Bucky (Winter Soldier), so their inclusion won't be much of a surprise. We keep hearing an odd fan-demand to bring back The Red Skull, I'm actually shocked considering how many more rogues Rogers has in the waiting.
We already know that Baron Wolfgang Von Strucker will be making his screen debut in Avengers: Age of Ultron. What I can only assume will reveal a stronger HYDRA presence worldwide, and Captain America's futile hunt-down all the cells. I would love to see Strucker in the next film, but there are a few others that also deserve a shot at Rogers.
One villain I've been dying to jump into this franchise is Baron Zemo, both Heinrich and Helmunt. A piece of Winter Soldier concept teases the lineage, which used the mission codename Operation: Zemo. This was apart of one of the museum exhibits of Rogers' WWII exploits with The Howling Commandos. Something that could used in a flashback scene, setting-up Heinrich as the staunch supporter of HYDRA. While his son Helmunt is conflicted and less committed to the cause, leading him to possibly switch-sides. We know that James Gunn (Guardians of The Galaxy) has been pitching Marvel a Thunderbolts movie, and Zemo is a funding member of that team.
Baron Strucker's right-hand woman Ophelia Sarkissian (Madame Hydra) should obviously make an appearance, considering we really haven't seen any mainstream female villains in the Earthbound Marvel films. She's quite the piece-of-work, and could even have ties to Black Widow's dark and bloody past. A relentless female villain set within this franchise would be worthwhile, and I know the Russo Brothers could extensively beef-up her character to that on the level of Zemo, or Strucker.
Her Viper persona was up-for-grabs when Fox made The Wolverine, because of her inclusion in X-Men comics. Fox made her a mutant and basically never mentioned her as being a terrorist. However, her HYDRA roots, her image and actual name are at Marvel, so they can use her in the films if they have the desire to. Marvel included Strucker and Madame Hydra in their video game (Captain America: Super Soldier) tie-in for The First Avenger.
Doctor Faustus seems like a no-brainer, if Marvel decides to pursue Bucky's origin as brainwashed assassin for HYDRA.
An interesting ally from the past could possibly Joseph Chapman, better known as the modern era version of Union Jack. We know that the character exists in the cinematic universe, thanks to an Easter Egg in Iron Man 2. The British hero is racing alongside Tony Stark at the Grand Prix, and is listed among the drivers. One of the funding members of The Howling Commandos, would be Chapman's mentor James Falsworth. Who fought alongside Rogers during a majority of his WWII missions. Like Sharon, bringing-in someone like Union Jack could be an interesting nod to his past.
The locations have been a bit lacking for such a globetrotting character, but we understood that Winter Soldier was meant to be more of a personal American-set story of corruption. If HYDRA is back we need an even grander base of operations. One location from the comics could be extremely extravagant, that being the New Zealand mountain-face Gehenna. This stunning HYDRA base would allow for some arresting moments of sheer beauty, possibly lending itself to some very unique action sequences.
Steve Rogers needs to pass-on the mantle to either Bucky Barnes or Sam Wilson. Chris Evans' contract is almost over, and we suspect that like in the comics, we'll see another hero become Captain America.
Marvel Studios has their own way of casting the supporting characters, including their villains, but have listened to fans on a few occasions (placing Benedict Cumberbatch on their wish-list for Doctor Strange). However, I'm still standing-behind Mads Mikkelson (Pusher 2, Hannibal, The Hunt, King Arthur, Valhalla Rising, Royal Affair) for Baron Helmut Zemo, Eva Green (300 Rise of An Empire, Kingdom of Heaven, Sin City 2, Casino Royale, Penny Dreadful) for Ophelia, Brendan Gleeson (The Guard, Gangs of New York, Braveheart, In Bruges, Calvary) for Doctor Faustus and Dan Stevens (Downton Abbey, The Guest) for Joseph Chapman (Union Jack).