Challengers of the Unknown #1, April-May 1958. Jack Kirby cover pencils & inks, Ira Schnapp letters.
Info from Grand Comics Database

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Challengers of the Unknown #1, April-May 1958. Jack Kirby cover pencils & inks, Ira Schnapp letters.
Info from Grand Comics Database
How are you feeling, Tornado?
(Justice League Unlimited Volume 2 #13)
Challengers of the Unknown Vol. 5 #2 (2025)
Art by: Sean Izaakse and Romulo Fajardo Jr.
Challengers of the Unknown #4
Batman/Superman: World's Finest Annual (2024)
written by Christopher Cantwell art by Jorge Fornes & Lee Loughridge
Gidge's Intro to The Challengers of the Unknown
First off, who are the Challengers of the Unknown? They are a team of adventurers. Their comic originates in the late 1950's, and it ran until 1978, ending with issue #87.
Their adventures are supremely stereotypical of the time. They start off as very pulpy sci-fi fantasy in the 60's and skew more mystical/occult through the 70's. They functioned as Jack Kirby's rough draft for the Fantastic Four, but even so, have slightly different dynamics.
DC Comics Announces "Challengers of the Unknown"
DC Comics "All In" initiative is bringing back the investigators of the strange and unusual, the Challengers of the Unknown. The Challengers of the Unknown 5-issue limited series will be written by Christopher Cantwell with art by Sean Izaakse. The comic spins out of Absolute Power and the DC All In Special.
The "terror of the Darkseid shock wave has cascaded across the DC Universe…tearing open the very fabric of time and space itself! Only one band of super-scientists have the right stuff to challenge the fate of a universe: the Challengers of the Unknown.
Ace Morgan, June Robbins, Prof Haley, Red Ryan, and Rocky Davis, adventurers “living on borrowed time,” run day-to-day operations for the Justice League’s Watchtower base in orbit above Earth, collaborating with Superman, Batman, Wonder Woman, and the rest of the League to seal the rifts that threaten the galaxy. But a mysterious foe from the Challengers’ past lurks in the shadows, and its connection to the Darkseid wave will put not only the Challengers, but all of the DC Universe on borrowed time."
Challengers of the Unknown #1 (of 5) goes on sale on December 18, 2024. The debut issue sports a main cover by Mike Deodato Jr., variant covers by Sean Izaakse and Romulo Fajardo Jr., Taurin Clarke, and Danny Earls, a foil variant cover by Gleb Melnikov, and a character design variant cover by Dan Mora.
(Image via DC Comics - Mike Deodato Jr.'s Cover of Challengers of the Unknown #1)