Some odd moments have made Marvel Comics canon over the years, but Elvis Presley learning guitar from the Eternal Makkari has to be one of the coolest (and oddest) ever. Yes, the Junk Yard Dog himself jammed with Makkari before he hit it big, and the hero bragged about it on multiple occasions. But, not only that, but the speedster helped Elvis learn the guitar in the early 1950s.
Elvis Presley has a surprising history in the pages of Marvel Comics, as he's made multiple appearances throughout the years in the comics. From being confirmed as an alien by Genis-Vell in Captain Marvel #19 to the revelation that he learned martial arts (specifically Kung Fu) from the Fat Kobra, Elvis Presley has a continued presence in Marvel Comics as the pop culture icon has impacted the lives of several heroes throughout the universe. However, his connection with Makkari of the Eternals might be his most notable, as the Eternal revealed to Quasar that he jammed with him before he became an international success and taught him a thing or two in the process.
In Quasar #28 by Mark Gruenwald, Greg Capullo, Harry Candelario, Joe Rosas, Janice Chung, and Kelly Converse, Makkari (sporting a look straight out of the early 90s) finds Quasar's guitar and tells him he didn't know he played. Makkari says that he used to play guitar himself, revealing he jammed with Elvis Presley once, "back before he hit it big, of course." Considering the Eternals are ancient beings, it's no surprise Makkari has met some famous people along the way, but jamming with Elvis is supremely cool.
To make matters more interesting, Marvel's Mystery Handbook 70th Anniversary expanded on Makkari's encounter with Elvis. In the comic, it's revealed Makkari took a brief break from trying to track down the Deviant Kro in the 1950s to "educate the soon-to-be-famous performer Elvis Presley." So, he did more than just jam with Elvis, he taught him something. Given the Eternals age, it's likely he forgot that he educated Elvis Presley when recounting the story to Quasar.
Much like the rest of the Eternals, Makkari has lived a long, interesting life away from the superheroics that come with being a member of the ancient beings. Meeting and teaching Elvis was a small footnote in Makkari's life, but is a fun little throwaway line that has made its way into Marvel Comics canon. Considering he's an alien, learned Kung Fu from Fat Cobra, and was taught guitar by Makkari, it would be fascinating to see a story showcasing the life Elvis Presley lived in the Marvel Universe - because it's got to be incredibly interesting.