The Challenger hop was originally bred at Wye College in 1961, as a combination of Northern Brewer and a German male downy-mildew resistant variety. Today, Challenger is primarily used in British ales and lagers in its native land, the UK.
Because of its lineage, Challenger has both a high level of alpha acids and a strong aroma. The result is a floral yet spicy hop that's moderate in intensity. This combination makes Challenger a hop that can be played with in a variety of different beer styles - mostly English - ranging from ESBs, porters, stouts, and brown ales. Add Challenger to the beginning of the boil to add some bitterness to the brew, or at the end to bring out the aroma. You'll get hints of marmalade, lemon, and spicy flavors from a Challenger-hopped beer.