The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When Talbot asks Betty why she is always helping the Hulk, they are standing next to a pipeline. When the shot changes, they have instantly moved several feet away from it.
The Return of the Beast: Part 1 - S1-E1
Other mistake: When Talbot is grilling Banner for his relationship with Betty, when Banner is saying "Someone like you perhaps," the screen briefly constricts and then expands back to normal size, similar to a window on a computer screen being maximized.
Answer: The Hulk is a giant brute who smashes everything in his path when he is angry. In Ang Lee's "Hulk," General Ross, played by Sam Elliot, explains it to his daughter.