The second trailer of “Avengers: Age of Ultron” was released by Marvel Entertainment on Monday, giving a closer look into the fight between the superheroes. The 100-second long video focuses on Tony Stark, also known as Iron Man, played by Robert Downey Jr.

“Everyone creates the thing they dread,” Ultron says in the beginning of the new trailer. The trailer hints at the film’s plot, which focuses on the robotic creation of Stark and a misstep by him in an attempt to direct Iron Man's drone forces to ease pressure on the Avengers. The trailer also focuses on the biggest fight -- among the Avengers themselves.

Here are a few things of note in the new trailer:

Who is Andy Serkis playing?

Andy Serkis, whose role in the film has not been revealed, is seen in the new trailer. Reports had surfaced earlier stating that the 50-year-old British actor could be playing Ulysses Klaw, a Black Panther villain, according to The Hollywood Reporter.

Will there be a Black Widow flashback?

The first trailer of “Avengers: Age of Ultron” had showed some shots of surgical equipment but did not give a clear picture into what they would lead to. The latest trailer links the Black Widow, played by Scarlett Johansson, to the equipment, giving rise to speculation that there might be a flashback into the character's life.

Who are the mysterious women?

The new trailer shows a mysterious female figure showing off some heavy weapons as she walks into what looks like the stronghold of Hydra, a secret criminal organization in the Marvel world. Baron Von Strucker, one of the leaders of Hydra, is conducting his experiments on the Maximoff twins -- Pietro and Wanda -- in the stronghold. Is the mysterious woman Black Widow?

In another shot, a second mysterious woman is seen walking inside a cave as she drops off a robe beside a pool. It is unclear who she is but reports say she could be a member of the Dora Milaje, or Black Panther's younger sister Shuri.

What is happening to the Hulk?

The new trailer gives a closer look at the battle between the Hulk and Hulkbuster. The trailer also confirms that Stark is inside the Hulkbuster armor, but it could be that Ultron is controlling it.

The much-awaited Marvel film is scheduled to hit theaters on May 1.

Here is the new trailer: