Summerwine Brewery in Yorkshire named a rum barrel-aged imperial stout called Calico Jack.

An imperial stout made by Foothills Brewing Company.

Mr. Scholz said the imperial stouts were made stronger and hoppier to survive the trip from England to Russia; they can be 9 percent alcohol.

Perhaps no stout has more of a rich, roasted quality than imperial stout, also known as Russian stout.

With more restrained flavors than imperial stouts and less alcohol, oatmeal stout is the one to reach for if you're having more than one.

There are a number of variations including Baltic porter, dry stout and imperial stout.

Barley wine and imperial stout are beers of similar strength from different brewing traditions.

One of The Bruery's more infamous beers is a bourbon barrel aged imperial stout known as "Black Tuesday."

Pride of Nekron: An imperial stout.

The brewery released the imperial stout Gudeløs (meaning "Godless") at the European Beer Festival 2008.