The eponymous heroes will have to work together to fend off dangerous threats, including a resurfaced Baron Zemo (Daniel Brühl) and a mysterious new anarchist group named The Flag Smashers.
Spellman served as creator and head writer on the project and, while he couldn't divulge any spoilers, he did give RadioTimes.com's The Big RT Interview some cryptic hints about what fans can expect from the final episode.
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"They will feel like Sam and Bucky are truly future-forward heroes," he said. "They are truly heroes whose roots are born from struggles and problems and triumphs of these times right now. So, in maybe more precise words, I feel like fans are going to walk away saying this was an extremely relevant superhero series."
The writer went on to hype up the character development the show has in store, going as far as to say the key players in the series will be "completely different" people by the time the credits roll on the final episode.
"Sharon Carter, Baron Zemo, Bucky Barnes, Sam Wilson and John Walker… who they are in the beginning of the series, they are completely different people by the end. They are almost reborn as new characters moving forward," he teased.
Fans will be keen to know exactly what he means by that, as they already have plenty of questions regarding whether Sam Wilson (Anthony Mackie) will be the next Captain America and what exactly Sharon Carter has been up to whilst in exile.
We get our first clues as the series debuts on Disney Plus today, with new episodes arriving weekly throughout the rest of March and April.
The Falcon and the Winter Soldier premieres exclusively on Disney Plus on Friday 19th March. You can sign up to Disney Plus for £7.99 a month or £79.90 a year now. Take a look at the rest of our Sci-fi and Fantasy coverage, or check out what else is on with our TV Guide.
