It's the middle of that universe-rebooting, best-Legion-creating DC crossover Zero Hour, and characters from various alternate earths keep popping up! Which might explain that evil version of Ambush Bug from earth-3. But in this case it's the return of (hey hey hey!) Fat Alfred from Earth-2, as seen in the earliest Alfred appearances!
The Alfred of the 1940s, as we've seen several times in the first half of 366 Days with Alfred, wanted to be a detective, and this version is no different: following and aiding modern-day Batman and Robin on an adventure.
Occurring during one of those periods when thin Alfred Pennyworth had temporarily left the service of Bruce Wayne, Alfred Beagle admirably serves the Dark Knight and the Boy Wonder, and reminds us of the basic essence of any Alfred there is: a faithful aid and retainer, no matter what universe he's in. Let's all raise a cup of tea to Alfred Beagle and his wish to become a detective! Maybe he's achieved that wish in the new Earth 2!