History isn't just dates. It's people. When Masterpiece PBS aired the drama, everyone started Googling the cast of Atlantic Crossing because the chemistry felt a bit too real to be just scripts and costumes. You've got the stoic King, the charismatic President, and at the center, a Crown Princess who basically carried the weight of a Norwegian future on her shoulders. It’s a messy, beautiful, and sometimes controversial look at World War II. Honestly, the casting directors hit a home run here. They didn't just find actors; they found people who could inhabit the suffocating tension of 1940s diplomacy.
Sofia Helin as Crown Princess Märtha
You probably know Sofia Helin from The Bridge. She was iconic as Saga Norén. Here? She’s unrecognizable. Helin plays Crown Princess Märtha with this quiet, simmering strength that makes you forget she’s acting. When Märtha flees the Nazi invasion with her children, Helin portrays a woman who is terrified but refuses to break. It's a performance about evolution. She starts as a shy royal and ends as a political powerhouse in Washington, D.C.
People often wonder if her relationship with Franklin D. Roosevelt was "real." The show leans into the ambiguity. Helin plays those scenes with a sort of desperate grace. She’s using what she has—her charm, her status, her proximity to power—to save her country. Some critics argued the show played fast and loose with historical facts regarding her influence on FDR, but Helin makes you believe in the stakes.
Kyle MacLachlan as Franklin D. Roosevelt
It's weird seeing Agent Cooper from Twin Peaks as FDR. At first, it’s jarring. Then, five minutes in, you're sold. Kyle MacLachlan captures that specific FDR "twinkle." He has the cigarette holder, the cape, and that booming, yet weary, optimism. It’s a hard role because Roosevelt is a legend, but MacLachlan keeps him human. He’s a man in a wheelchair who is also the most powerful person on the planet, flirting with a Princess while the world burns.
MacLachlan’s performance highlights the "Atlantic Crossing" between the personal and the political. He isn't just a caricature of a President. He’s a lonely man who finds a kindred spirit in Märtha. The chemistry between him and Helin is what keeps the middle episodes of the series afloat. Without their specific dynamic, the show would just be a dry history lesson. Instead, it’s a character study of two people who aren't supposed to be close but can't help it.
Tobias Santelmann as Crown Prince Olav
Tobias Santelmann is everywhere lately. From The Last Kingdom to Exit, he’s the go-to guy for intense, brooding Norwegians. In the cast of Atlantic Crossing, he plays the foil to Märtha’s American adventure. While she’s in D.C. rubbing elbows with the elite, he’s in London with his father, King Haakon, trying to run a government-in-exile.
The tension Santelmann brings to the screen is palpable. He’s jealous. He’s frustrated. He’s stuck in the rain in England while his wife is becoming a media darling in America. It’s a thankless role in some ways because Olav can come across as prickly, but Santelmann gives him enough vulnerability that you actually feel for him. He’s a man losing his role as a protector.
The Supporting Powerhouses
- Søren Pilmark as King Haakon VII: Pilmark is a legend in Danish acting. He plays the King with a backbone of pure steel. He is the moral compass of the show.
- Anneke von der Lippe as Ragni Østgaard: She plays Märtha’s lady-in-waiting and confidante. Their friendship is the emotional spine of the household in Maryland.
- Harriet Sansom Harris as Eleanor Roosevelt: If you want a masterclass in subtlety, watch Harris. She plays Eleanor not as a jealous wife, but as a woman who understands the "game" better than anyone. She knows FDR needs Märtha, and she allows it for the greater good, even if it hurts.
Why the casting mattered for the 1940s vibe
Authenticity is a fickle thing in period dramas. If the actors feel "too modern," the whole thing falls apart. The cast of Atlantic Crossing avoids this trap because they lean into the stiff formality of the era. They talk with their eyes. The show spends a lot of time in the Pook’s Hill estate in Maryland. It’s a confined space. In those rooms, the actors have to convey months of war anxiety with just a glance over a cocktail glass.
There was some pushback from historians, particularly in Norway. They felt the show gave Märtha too much credit for "Look to Norway" and other political maneuvers. But from an acting perspective? The cast justifies the narrative choices. They make the emotional truth feel more important than the literal timeline.
The Language Barrier (Or Lack Thereof)
One of the coolest things about this cast is the linguistic gymnastics. You have Norwegian actors speaking English with varying degrees of "royal" polish. It adds a layer of realism. When Märtha first arrives in the US, she’s hesitant. Her English is formal and stiff. By the end, she’s much more fluid. Helin tracked that progression perfectly. It’s a detail most people miss, but it’s why the show feels lived-in.
What you should do next to appreciate the history
Watching the show is one thing, but if you want to see how much the cast of Atlantic Crossing actually looked like their real-life counterparts, you have to do a little digging. The physical transformations were intense.
- Check the archives: Look up the real photos of Crown Princess Märtha and FDR at Hyde Park. The costuming department for the series followed these photos almost to the stitch.
- Read "Franklin and Lucy": If you're curious about FDR's real-life wandering eye, this book by Joseph E. Persico covers his relationships (though it focuses more on Lucy Mercer, it gives context to the environment Märtha entered).
- Watch the "Making Of" clips: Masterpiece often releases behind-the-scenes footage where Helin discusses how she learned the specific dialect of the 1940s Norwegian royalty.
The show works because it doesn't try to be a textbook. It tries to be a diary. The actors took these historical giants and made them feel like people you’d want to have a drink with—or at least people you’d worry about during a blitz. It’s a heavy show, but the cast makes it go down easy. Focus on the performances of Helin and MacLachlan; their "will-they-won't-they" energy is what really drives the plot forward, regardless of what the history books say about the actual diplomatic cables.