Here's #28! Click here for the master list!
The Brave and the Bold #28
The no-brainer train is coming around the bend again!
That said, let me note that I am quite disappointed that I could not find room for the first appearance of one of my favorite comic book characters, Sean Cassidy, the Banshee, who made his bow in X-Men #28.
However, while the poor Molten Man made his debut in Amazing Spider-Man #28, Batman made his second appearance in Detective Comics #28, Marvel Premiere #28 first introduced us to the Legion of Monsters, the X-Men had a notable team-up with the FF in Fantastic Four #28, Saga of the Swamp Thing #28 was the last issue that they intentionally had the Comics Code on it, Doom Patrol #28 had an awesome fight with the Brotherhood of the Dada and Sandman and Cerebus both had good #28s.
That all said, this number obviously belongs to The Brave and the Bold, which is the introduction of the Justice League of America by Gardner Fox and Mike Sekowsky.
This is also, memorably, the first time Aquaman ever appeared on a comic book cover!!!!!
So, yeah, this is definitely the pick, but you folks can name some other notable #28s! Quasar #28 had Her search for a mate with a pretty uneven cover by Greg Capullo!