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Marvel will release X-Men: Children of the Atom Set Slipcase, a complete collection of the 1960s and 1970s X-Men stories, at $500 MSRP on March 4, 2020.  The slipcase will house nine high page-count hardcover X-Men Slipcase Edition volumes:

X-Men: Silver Age Vol. 1 — Gifted Youngsters Premiere (Slipcase Edition)
Collecting X-Men (1963) #1-13, Fantastic Four (1961) #28 and Annual #3 and material from Tales of Suspense (1959) #49, Strange Tales (1951) #120 and Journey Into Mystery (1952) #109. 400 pgs.

X-Men: Silver Age Vol. 2 — Divided We Fall Premiere (Slipcase Edition)
Collecting X-Men (1963) #14-31. 384 pgs.

X-Men: Silver Age Vol. 3 — The Torch Is Passed Premiere (Slipcase Edition)
Collecting X-Men (1963) #32-48 and Avengers (1963) #53. 384 pgs.

X-Men: Silver Age Vol. 4 — Twilight of the Mutants Premiere (Slipcase Edition)
Collecting X-Men (1963) #49-66, Ka-Zar (1970) #2-3 and Marvel Tales (1964) #30. 416 pgs.

X-Men: The Lost Years Premiere (Slipcase Edition)
Collecting Amazing Spider-Man (1963) #92; Incredible Hulk (1968) #150, #161, #172 And #180-181; Amazing Adventures (1970) #11-17; Marvel Team-Up (1972) #4 and #23; Avengers (1963) #110-111; Captain America (1968) #172-175; Defenders (1972) #15-16; and Giant-Size Fantastic Four #4. 480 pgs.

X-Men: Bronze Age Vol. 1 — All-New & All-Different Premiere (Slipcase Edition)
Collecting Giant-Size X-Men #1, X-Men (1963) #94-108, Amazing Spider-Man (1963) #161-162, Marvel Team-Up (1972) #53 and Annual #1 and Iron Fist (1975) #15. 424 pgs.

X-Men: Bronze Age Vol. 2 — Magneto Triumphant Premiere (Slipcase Edition)
Collecting X-Men (1963) #109-124, X-Men Annual (1970) #3, Marvel Team-Up (1972) #69-70 and #89, Incredible Hulk Annual #7 and Power Man and Iron Fist (1978) #57. 440 pgs.

X-Men: Bronze Age Vol. 3 — The Fate of the Phoenix Premiere (Slipcase Edition)
Collecting X-Men (1963) #125-141, Uncanny X-Men (1981) #142-143, X-Men Annual (1970) #4, Marvel Two-In-One (1974) #68 and material from Marvel Treasury Edition #26-27 and Marvel Team-Up (1972) #100. 472 pgs.

X-Men Companion Premiere (Slipcase Edition)
Collecting Phoenix: The Untold Story and material from F.O.O.M. #10 and Not Brand Echh #4 and #8. 200 pgs.

The set will also include an X-Men: Children Of The Atom Box Set Slipcase Poster (Slipcase Edition).

Marvel has previously reserved the $500 slipcase edition format for its biggest Marvel Cinematic Universe franchise, the Avengers (see “’Earth’s Mightiest Box Set’”), a sign of the importance that Marvel is placing on its new reunion with the X-Men franchise in the wake of Disney’s acquisition of Fox’s entertainment assets.  The move is part of a renewed emphasis on the X-Men characters in Marvel’s publishing, which is launching six new titles and a renewal of the franchise under Jonathan Hickman (see “Marvel Announces Six New X-Series”).