Spectacular Spider-Man Annual #10 and Web of Spider-Man Annual #6, 1990
Described (tongue in cheek, hopefully) as a “micro-crossover,” Spidey’s Totally Tiny Adventure is a three-part story from 1990, running in the summer annuals. (Amazing Spider-Man Annual #24, The Spectacular Spider-Man Annual #10, The Web of Spider-Man Annual #6).
The story, as you might guess, features Spider-Man shrinking down to Ant-Man size and beyond. It’s definitely a bit light-hearted without devolving into straight camp. (Our friends at Pulp and Dagger have a full review here.)
Gil Kane drew chapters one and three, and Rich Buckler tackled chapter two. And a trivia note: Stan Lee scripted both chapters two and three, marking a rare return to the keyboard for the Spidey’s co-creator.