....but, where to find reprints of those characters?
Sadly, Immortal Man and Dolphin haven't been collected anywhere but their original solo appearances in Strange Adventures and Showcase, but here are the rest of the team...
....under the Nick Cardy cover that was the inspiration for the mock-up above.
...are collected in black and white in Showcase Presents: Rip Hunter: Time Master Volume 1, which gets readers about half of Rip's original adventures!
Sadly, we are lacking in reprints of Rip Hunter and his team in their green uniforms, which they didn't adopt until later.
....and a new story with Superman, Green Arrow, Flash and Green Lantern fighting a magical menace all under a Nick Cardy cover!
The Sea Devils had their 3 Showcase issues and first 16 issues collected in black and white in the Showcase Presents: The Sea Devils Volume 1.
Metallo in the DC Silver Age Classics Action Comics #252 of 1992 and the Millennium Edition: Action Comics #252 of 2000.
Congorilla's time in "The One-Ape Circus" of Action Comics #259 (December, 1959) was reprinted in World's Finest Comics #150 (June, 1965), under a wild Superman/Batman cover by Curt Swan and George Klein.
"Congorilla's Last Stand: from Action Comics #261 (February, 1960) made it into World's Finest Comics #151 (August, 1965), with an even odder cover by Curt Swan and George Klein.
"The Congorilla In Space" story from Adventure Comics #276 (September, 1960) was reprinted in World's Finest Comics #149 (May, 1965), with an ominous Curt Swan/George Klein cover.
It's also worth noting that Congorilla and Congo Bill's aid with Superman's battle with Brainiac from Action Comics #280 (September, 1961) was reprinted in color in Superman Family #168 (December-January, 1974/1975)...
...also under a Nick Cardy cover!
Strange Adventures #195 (December, 1966) saw its Animal Man story reprinted in Adventure Comics #420 (June, 1972) under an infamous Supergirl cover by Bob Oksner.
These Animal Man stories could all easily fit in a 100 page reprint...
...and even include Dolphin's one and only solo story, and maybe room for a little more, like one of Immortal Man's original stories!
Enchantress' second (of three) solo appearances, from Strange Adventures #191 (August, 1966) was reprinted in Adventure Comics #419 (May, 1972) under a Supergirl cover by Bob Oksner (and maybe these explain why Enchantress was revived in Superman Family to face Supergirl later....), sadly not seeing Strange Adventures #200's Enchantress tale reprinted at all (and Enchantress making the cover, but not the inside of a Supergirl Giant, Adventure Comics #416).
Suicide Squad and Cave Carson
Cave Carson's only reprint (from his first appearance in Showcase #31 of August-September, 1960) was also reprinted in the Best of DC #26 (July, 1982). Wouldn't you dig a collection of his 8 original stories from Brave and the Bold and Showcase?
Now, if we could just get a collection of early appearances of the Monitor from the Crisis on Infinite Earths, we could see a collection of DC Comics Presents #77 and #78 (which also features the beginnings of the Forgotten Villains, led by the Enchantress, and including villains from the Sea Devils and Rip Hunter!).