*Marvel: Literally, in this case, the Marvel Super-Heroes ‘tryout’ title that flourished for a couple of years in the late 1960’s, which we turn to for this week’s entry in our third party graded Slab Happy event. This extra-thick squarebound presented new concepts to a waiting audience – backed up by vintage reprints! Issue #13, the second in the showcase format, presented the second appearance of Captain Marvel, the Space-born warrior from the Kree Empire – but more importantly, at least in retrospect, it featured the first appearance of Carol Danvers – then a mere security chief, but later Ms. Marvel, and herself current holder of the Captain Marvel title. Issue #18, meanwhile, gave us the first (and for half a decade, only) appearance of the Guardians of the Galaxy, extraterrestrial adventurers banded together to liberate Earth from the all-conquering Badoon in the 31st Century. A failure at the time of launch, the Guardians went on to have a successful career in the 1980’s and 1990’s, before a radically different line-up was concocted for the cinematic version. #13 is a CGC Blue Label 7.0 (FN/VF) at £225; #18 is PGX 8.5 (VF+) at £350.