Through examining ethnographic material alongside a forum discussion on the website
ultrastifo, this paper relates fan solidarities occasionally asserted between certain members
of Green Brigade (Celtic FC) and the Bad Blue Boys (NK Dinamo Zagreb) to what I term fan
cosmologies. I first describe my theoretical positioning with respect to fan activist groups and
initiatives, before making some notes concerning the two fan groups' political contexts. I then
consider the empirical material, concluding with a brief discussion of fan cosmologies as an
approach to studying football fan groups anthropologically.