Answer by taking a quote from the following article:

Captain Marvel, also known as Shazam (), is a fictional superhero appearing in American comic books published by DC Comics. Artist C. C. Beck and writer Bill Parker created the character in 1939. Captain Marvel first appeared in Whiz Comics #2 (cover-dated Feb. 1940), published by Fawcett Comics.

After the success of National Comics' new superhero characters Superman and Batman, Fawcett Publications started its own comics division in 1939, recruiting writer Bill Parker to create several hero characters for the first title in their line, tentatively titled Flash Comics. Besides penning stories featuring Ibis the Invincible, Spy Smasher, Golden Arrow, Lance O'Casey, Scoop Smith, and Dan Dare for the new book, Parker also wrote a story about a team of six superheroes, each possessing a special power granted to them by a mythological figure.  Fawcett Comics' executive director Ralph Daigh decided it would be best to combine the team of six into one hero who would embody all six powers. Parker responded by creating a character he called "Captain Thunder". Staff artist Charles Clarence "C. C." Beck was recruited to design and illustrate Parker's story, rendering it in a direct, somewhat cartoony style that became his trademark. "When Bill Parker and I went to work on Fawcett's first comic book in late 1939, we both saw how poorly written and illustrated the superhero comic books were," Beck told an interviewer. "We decided to give our reader a real comic book, drawn in comic-strip style and telling an imaginative story, based not on the hackneyed formulas of the pulp magazine, but going back to the old folk-tales and myths of classic times".  The first issue of the comic book, printed as both Flash Comics #1 and Thrill Comics #1, had a low-print run in the fall of 1939 as an ashcan copy created for advertising and trademark purposes. Shortly after its printing, however, Fawcett found it could not trademark "Captain Thunder", "Flash Comics", or "Thrill Comics", because all three names were already in use. Consequently, the book was renamed Whiz Comics, and Fawcett artist Pete Costanza suggested changing Captain Thunder's name to "Captain Marvelous", which the editors shortened to "Captain Marvel". The word balloons in the story were re-lettered to label the hero of the main story as "Captain Marvel". Whiz Comics #2 (cover-dated Feb. 1940) was published in late 1939.  The first post-Crisis appearance of Captain Marvel was in the 1986 Legends miniseries. In 1987, Captain Marvel appeared as a member of the Justice League in Keith Giffen's and J. M. DeMatteis' relaunch of that title. That same year (spinning off from Legends), he was given his own miniseries titled Shazam!: The New Beginning. With this four-issue miniseries, writers Roy and Dann Thomas and artist Tom Mandrake attempted to re-launch the Captain Marvel mythos and bring the wizard Shazam, Dr. Sivana, Uncle Dudley, and Black Adam into the modern DC Universe with an altered origin story. Roy Thomas, a veteran comic book writer and editor, had been lured from Marvel Comics to DC in 1981 with the specific contractual obligation that he would become the main writer of Shazam! and the Justice Society of America characters. Before the Crisis, Thomas wrote several of the DC Comics Presents stories featuring the Marvel Family.  The most notable change that the Thomases, Giffen, and DeMatteis introduced into the Captain Marvel mythos was that the personality of young Billy Batson is retained when he transforms into the Captain. This change would remain for most future uses of the character as justification for his sunny, Golden-Age personality in the darker modern-day comic book world, instead of the traditional depiction used prior to 1986, which tended to treat Captain Marvel and Billy as two separate personalities.  This revised version of Captain Marvel also appeared in one story-arc featured in the short-lived anthology Action Comics Weekly #623-626 (October 25, 1988 - November 15, 1988), in which a Neo-Nazi version of Captain Mazi was introduced. At the end of the arc, it was announced that this would lead to a new Shazam! ongoing series. Though New Beginning had sold well and multiple artists were assigned to and worked on the book, it never saw publication due to editorial disputes between DC Comics and Roy Thomas. As a result, Thomas' intended revival of the Marvel Family with a new punk-styled Mary Bromfield/Mary Marvel (aka "Spike") who was not Billy's sister, and an African-American take on Freddy Freeman/Captain Marvel Jr., did not see print. Thomas departed DC in 1989, not long after his removal from the Shazam! project.  Other attempts at reviving Shazam! were initiated over the next three years, including a reboot project by John Byrne, illustrator of Legends and writer/artist on the Superman reboot miniseries The Man of Steel (1986). None of these versions saw print, though Captain Marvel, the Wizard Shazam, and Black Adam did appear in DC's War of the Gods miniseries in 1991. By this time, DC had finally ceased the fee-per-use licensing agreement with Fawcett Publications and purchased the full rights to Captain Marvel and the other Fawcett Comics characters.  In 1991, Jerry Ordway was given the Shazam! assignment, which he pitched as a painted graphic novel that would lead into a series, rather than starting the series outright. Ordway both wrote and illustrated the graphic novel, titled The Power of Shazam!, which was released in 1994. Power of Shazam! retconned Captain Marvel again and gave him a revised origin, rendering Shazam! The New Beginning and the Action Comics Weekly story apocryphal while Marvel's appearances in Legends and Justice League still counted as part of the continuity.  Ordway's story more closely followed Captain Marvel's Fawcett origins, with only slight additions and changes. The graphic novel was a critically acclaimed success, leading to a Power of Shazam! ongoing series which ran from 1995 to 1999. That series reintroduced the Marvel Family and many of their allies and enemies into the modern-day DC Universe.  Captain Marvel also appeared in Mark Waid and Alex Ross's critically acclaimed 1996 alternate universe Elseworlds Kingdom Come miniseries. Set 20 years in the future, Kingdom Come features a brainwashed Captain Marvel playing a major role in the story as a mind-controlled pawn of an elderly Lex Luthor. Because he is one of the most powerful beings on Earth, his mere presence unnerves many of those around him and, brainwashed, he even sets out to cause what could lead to the end of the world. However, Marvel ultimately sacrifices himself as an act of redemption and, as a figure of martyrdom, becomes the symbol of a new world order.  In 2000, Captain Marvel starred in an oversized special graphic novel, Shazam! Power of Hope, written by Paul Dini and painted by Alex Ross.

Who are some of the other characters in this comic?
Thomas' intended revival of the Marvel Family with a new punk-styled Mary Bromfield/Mary Marvel (aka "Spike") who was not Billy's sister,