The latest updates and spoilers for "Avengers 4" reveal the possible appearance of "Young Avenger" members Wiccan and Speed in the movie. Auditions Free (via SuperBroMovies) announced new casting calls for identical twin baby boys in the sequel and the description teased that they are the children of Scarlet Witch and Vision.

There is also a new flashback scene featuring a young Steve Rogers before the events of World War 2, and the scene will connect to the present plotline of the sequel.

Who are Wiccan and Speed?

In the Marvel comics, Wiccan and Speed are the two superpowered twin sons of Scarlet Witch and Vision.

They are born from the chaos magic of their mother as Wanda cannot conceive children due to Vision being an android. However, the couple soon found out that the boys are two shards of Mephisto's soul and the demonic villain absorbed them to become whole again.

The revelation distraught Wanda to the point of madness and her powers became unstable that led to the deaths of Avenger members Hawkeye and Scott Lang. Her unstable magic also created an alternate present reality called "House of M" and depowered 90 percent of the mutant population on earth.

Wanda's children were reincarnated after the events of "House of M, " and they are Billy Kaplan and Tommy Sheperd. Billy inherited her mother's chaos magic and reality warping powers, while Tommy has super speed and quick reaction similar to his uncle, Quicksilver.

The twins became members of the Young Avengers, and they have fought beside Captain America against Iron Man during the first Marvel Civil War.

While it is unknown how Wanda will conceive children in "Avengers 4," comic book fans speculated that it might have something to do with the Infinity Stones since they have the power to reshape the universe depending on the user's desires.

Perhaps, Marvel Studios will reveal more details about the fourth film in the aftermath of "Infinity War."

New flashback scenes posted a new behind-the-scenes photo the sequel set in the early 40's and the scene will feature Chris Evan's reprising his role as Steve Rogers. While the photo did not reveal too much about the movie, comic book theorizes that the flashback will reveal more about Steve's backstory before he joined the war and super soldier program.

Stever Rogers will have a new code name and a bearded look in "Avengers: Infinity War," as he leads Scarlet Witch, Falcon, and Black Widow to rescue Vision from Proxima Midnight.

The fourth movie will feature all of the MCU heroes band together to stop Thanos's final assault on earth by using the full power of the Infinity Stones.