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Watch Marvel's Avengers - Season 3 Episode 21 Online!:

Following Truman Marsh replacing Hulk with Red Hulk, the Avengers must stop Leader from building and unleashing his secret weapon.

Writing:
  • Stan Lee
  • Jack Kirby
  • Man of Action

Stars:
Release Date: 2013-05-26
Seasons: 1 2 3 4 5
TMDb: 7.6/10
  • Country: US, GB
  • Language: English
  • Runtime: 22

Other episodes for this season

Adapting to Change
Episode 1 - Adapting to Change
The Ultimates
Episode 2 - The Ultimates
Saving Captain Rogers
Episode 3 - Saving Captain Rogers
Under Siege
Episode 4 - Under Siege
The Thunderbolts
Episode 5 - The Thunderbolts
Thunderbolts Revealed
Episode 6 - Thunderbolts Revealed
Into the Dark Dimension
Episode 7 - Into the Dark Dimension
Dehulked
Episode 8 - Dehulked
Inhumans Among Us
Episode 9 - Inhumans Among Us
The Inhuman Condition
Episode 10 - The Inhuman Condition
The Kids Are Alright
Episode 11 - The Kids Are Alright
The Conqueror
Episode 12 - The Conqueror
Into The Future
Episode 13 - Into The Future
Seeing Double
Episode 14 - Seeing Double
A Friend in Need
Episode 15 - A Friend in Need
Captain Marvel
Episode 16 - Captain Marvel
Panther's Rage
Episode 17 - Panther's Rage
Ant-Man Makes It Big
Episode 18 - Ant-Man Makes It Big
The House of Zemo
Episode 19 - The House of Zemo
U-Foes
Episode 20 - U-Foes
Building the Perfect Weapon
Episode 21 - Building the Perfect Weapon
World War Hulk
Episode 22 - World War Hulk
Civil War (1): The Fall of Attilan
Episode 23 - Civil War (1): The Fall o...
Civil War (2): The Mighty Avengers
Episode 24 - Civil War (2): The Mighty...
Civil War (3): The Drums of War
Episode 25 - Civil War (3): The Drums...
Civil War (4): Avengers Revolution
Episode 26 - Civil War (4): Avengers R...