"All your adult life you've been a janitor, Jason Grubb..."
Storyline
A disgruntled janitor uses a time machine to travel to King Arthur's time to pose as a sorcerer using technology. None of it works independently, and he is forced to mop up the great hall.
Story Notes
Narrated in the second person. Possible Burgos pencils per Michael J. Vassallo and Jim Vadeboncoeur, Jr via the Timely/Atlas Facebook page. Previous indexer credited Bob Forgione. Inks credit per Michael J. Vassallo from Marvel Masterworks: Atlas Era Tales of Suspense (Marvel, 2006) #1 (2006).
Story is pages 10-14 of comic (pages of story numbered 1 to 5).