Fans of the MCU are likely aware that the Vision is an android, but what they might not know is that he's made out of one of Marvel's very first super heroes, the original Human Torch. Contrary to what some may believe, the Fantastic Four's Johnny Storm is not the first Marvel hero to use the moniker. The original Human Torch (later simply known as the Torch during Marvel's Dark Reign era) is a synthetic being created by scientist Phineas Horton in the early 1940s. He was Marvel's first superhero alongside his fellow Invaders Namor and Captain America, and the Torch even had a brief cameo in the Captain America: The First Avenger movie.
Although he has on occasion been depicted as being created from more classically robotic mechanic and metallic materials, the Torch is generally portrayed as a completely synthetic being, complete with artificial blood, organs, and DNA. He even has a need to eat, sleep and breathe, which has made him susceptible to attacks that generally wouldn't affect a robot, like poisonous gas. Early writers depicted his bones as being made out of a ceramic material, but Torch's most amazing components are his "Horton cells." These cells are synthetic replicas of human cells created from plastic and carbon polymers. They can be grown in a lab, are compatible with "real" or organic physiology, and can utilize huge amounts of power.
When the renegade A.I. and Avengers villain Ultron decided he wanted to create his own son, the Torch's status as the first artificial being in the Marvel universe made him the ideal blueprint for bringing a new synthezoid to life. So ideal in fact, that Ultron tracked down the remains of Torch's body and stole it in order to create the Vision. Ultron added his own robotic modifications to the Torch's body while creating the Vision, who, despite having his own unique personality and no memory of the Torch's life, would go on to follow in his footsteps as a hero.
It did not take long for the Vision to turn on Ultron and join the Avengers in Avengers #58 by Roy Thomas and John Buscema, continuing the heroic, Hitler-killing legacy of the Torch. Their powers and appearances may be different, but as Ant-Man (Scott Lang) discovered in Avengers Forever, their interior workings are actually identical. This is due to the fact that the time traveling Immortus (aka Kang the Conqueror) used a device known as the Forever Crystal to split the Torch's timeline before Ultron stole his body. So while Ultron created the Vision out of one Torch, another version of the Torch continued to exist in the Marvel universe. At least that's how it was made to seem.
The theory that the Vision was created from the body of the original Torch is debunked by Hank Pym in West Coast Avengers #50 by John Byrne. It's here where it's revealed that the idea that the Vision was built using the duplicate of the original Torch as part of a plot by Immortus to master time itself. So while the Vision might not be a direct continuation of the original Human Torch, he can be more appropriately be thought of as a legacy hero created from the spare parts of his older brother.