Back in 1994, MARVELS took comic book fans on a nostalgic journey with its four-issue miniseries written by Kurt Busiek with art by Alex Ross in the book that put the latter on the Marvel map. As seen through the eyes of photographer Phil Sheldon, MARVELS told the origin stories of Marvel Super Heroes in a way that set itself apart in the mid-1990s. Ross's stunning artwork was a departure from the way comics generally looked throughout the decade, instead taking on a more painterly, vintage look -- all designed to make Marvel's classic characters appear as close to real as possible.

In celebration of the 25th anniversary of MARVELS, 20 comics will feature variant covers this spring that will pay tribute to Ross's work and the old-fashioned look of classic comics. Here is the complete list of artists whose work will appear on upcoming issues of Marvel Comics, and you can see a gallery of 12 of the covers below:

AMAZING SPIDER-MAN #23 by Daniel Acuna

AMAZING SPIDER-MAN #24 by Mark Brooks

AVENGERS #20 by Paolo Rivera

BLACK PANTHER #13 by David Mack

CAPTAIN AMERICA #12 by Julian Totino Tedesco

CAPTAIN MARVEL #6 by Mico Suayan

CHAMPIONS #6 by In-Hyuk Lee

CONAN THE BARBARIAN #7 by Carlos Pacheco (pencils), Aneke (inks), and Dean White (colors)

DAREDEVIL #7 by Leinil Yu (pencils) and Sunny Gho (colors)

DEADPOOL #13 by Adi Granov

DOCTOR STRANGE #18 by Alan Davis (pencils), Mark Farmer (inks), and Matt Hollingsworth (colors)

FANTASTIC FOUR #11 by Nick Bradshaw (pencils) and John Rauch (colors)

GUARDIANS OF THE GALAXY #6 by Gerald Parel

IMMORTAL HULK #19 by Greg Smallwood

MARVEL TEAM-UP #3 by Marcos Martin

SAVAGE AVENGERS #2 by Tomm Coker (pencils) and Michael Garland (colors)

THOR #14 by Yasmine Putri

TONY STARK: IRON MAN #13 by Clayton Crain

UNCANNY X-MEN #19 by Phil Noto

VENOM #15 by Simone Bianchi

Click through the gallery below to see some of these marvelous covers: