Red Skull

Johann Schmidt, a.k.a.Red Skull, is a supervillain in Marvel Comics who appears in Marvel's 2011 film Captain America: The First Avenger. He was portrayed by Hugo Weaving.

Personality
Red Skull is the total counterpoint to his arch-enemy Captain America; while Rogers is good and selfless, the Skull is evil and ambitious. He has little patience for failure and is capable to kill his own minions for giving him bad news. He also has a god complex, and despite wearing a normal-looking mask over his skull face, he later eschews it to signal his pride on his own detachment of humanity.

Marvel Cinematic Universe
In Captain America The First Avenger Johann Schmidt is the leader of HYDRA, the science branch of the Nazis. He goes to Norway ang gets the Tesseract to power his weapons. When some high-ranking Nazi officers go to oversee his results, they find he has his own plans to take over the world, including Germany, and Schmidt kills them.

When Captain America goes to rescue some HYDRA prisoners, he ends facing Schmidt, who proves to be strong enough to dent Cap's shield. He then reveals his Red Skull face, revealing he was Erskine's first supersoldier experiment. Then he escapes.

As days pass, Captain America thwarts several of Red Skull's operations, culminating on the capture of his right-hand man scientist Arnim Zola, who gives the location of the Skull's main base out of fear. So Captain America finds Red Skull and makes him pay for stealing the Tesseract to use it for his evil plan. The Red Skull takes the Tesseract to a ship from where he plans to bomb the world's capitals, but Cap gets on board and fights him. Red Skull tries to escape with the Tesseract, but it seemingly disintegrates him as he tried to take the fully charged Tesseract with his bare hands.

Red Skull makes a cameo in The Avengers during Captain America's flashback.

The Avengers: Earth's Mightiest Heroes
Near the end of World War Two, Red Skull tries to use a portal to bring Asgardian creatures to Earth, that will be controlled to serve him. His plan is stopped by Captain America and Bucky, but when the heroes try to stop his escape by plane, Red Skull rigs the plane to explode and ejects himself. Bucky dies in the explosion while Captain America falls and is frozen for several years.

Phineas and Ferb: Mission Marvel
Red Skull is one of the villains in the upcoming special.