本剧根据漫威漫画《What If...?》改编，用动画影集的方式去探索漫威电影宇宙中的关键时刻并将其翻转过来，探讨如果史蒂夫·罗杰斯没有接受实验，而是卡特探员成为超级战士等另一种走向，从而带领观众进入未知领域。

讲述了一位坚强聪明的高级住院医师在一位对未来充满理想的年轻医生到医院上班的第一天对其进行指导，给他讲述了在现在的医院中的好好坏坏，打破他美好的愿景。

After the ordeal with Samara, Rachel and Aiden move to a rural town. But soon Rachel learns about the death of a girl in a similar fashion. To save Aiden, she must dig into Samara's past even further.

灭霸被终结后，“美国队长”史蒂夫·罗杰斯卸任，将盾牌交给了“猎鹰”山姆·威尔逊，相信他能够继承美国队长的精神。此后，“猎鹰”山姆·威尔逊和“冬兵”巴基·巴恩斯联合参与了一场全球性冒险行动 ……

Following the events of Age of Ultron, the collective governments of the world pass an act designed to regulate all superhuman activity. This polarizes opinion amongst the Avengers, causing two factions to side with Iron Man or Captain America, which causes an epic battle between former allies.

After the cataclysmic events in New York with The Avengers, Steve Rogers, aka Captain America is living quietly in Washington, D.C. and trying to adjust to the modern world. But when a S.H.I.E.L.D. colleague comes under attack, Steve becomes embroiled in a web of intrigue that threatens to put the world at risk. Joining forces with the Black Widow, Captain America struggles to expose the ever-widening conspiracy while fighting off professional assassins sent to silence him at every turn. When the full scope of the villainous plot is revealed, Captain America and the Black Widow enlist the help of a new ally, the Falcon. However, they soon find themselves up against an unexpected and formidable enemy—the Winter Soldier.