A Testosterone Brigade is a humorous name for online fan clubs of female science fiction actors created by or mostly for men. These brigade names are considered to be an offshoot or parody of the Estrogen Brigade phenomenon. They are often preceeded by the name of the actor in question, and are enjoyed by fans across the spectrum, ranging from the fanatical stalker to the casual appreciator, with everything in between.

The brigades are commonly abbreviated using the actor's initials follwed by the letters TB.

A more common variant of the Testosterone brigade type of fan club is the Estrogen Brigade, abbreviated in the same manner as above but with EB instead.

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