Marvel's Avengers (2013)

S1E4 The Serpent of Doom

Title: The Serpent of Peril Plot: Convinced that his own life is the key to the planet's survival, Thor prepares to make the ultimate sacrifice against Doctor Doom. The villain has unleashed the fearsome Midgard Serpent, wielding a formidable Asgardian artifact to do so. As the stakes rise, Thor must confront his fate to thwart Doom's destructive plans and protect Earth from impending doom.