Hulk

The Hulk (aka Bruce Banner), is an anti-hero and founding member of the Avengers.

Loki's Manipulation / Formation of the Avengers
In an plot to seek revenge against his half brother Thor, Loki attempted to lure Thor into a confrontation by using the Hulk to grab his attention. Loki manipulated the Hulk into accidentally derailing a train, however the Hulk was able to prevent tragedy by supporting the damaged railing with his own super strength.

The Space Phantom and Leaving the Avengers
When the Space Phantom came to Earth and fought against the Avengers, his meddling allowed the Hulk to see how much his teammates hated him. Once the menace of the Space Phantom was dealt with, the Hulk decided to leave the Avengers.

Powers
Leaping - The Hulk can propel himself through the air, leaping for great distances at a time.

Super Strength