Following a brief prologue in which Mia gives birth, the pic hopscotches to Moscow, where federal agent Hobbs (Dwayne Johnson, reprising his “Fast Five” character) surveys the damage from a violent attack on a Russian military convoy. The culprit, Hobbs explains to his new partner (“Haywire” star and real-life MMA champion Gina Carano), is Owen Shaw (the snarling Luke Evans), an international man of mystery seeking to build a dirty bomb capable of knocking out an entire country’s military defense systems. Shaw doesn’t intend to use the bomb himself, for which he needs only one more component part, but rather to sell it to the highest bidder. In a departure from the latest vogue in movie villains, this one isn’t an ideological, bin Laden-esque terrorist, but rather a stone-cold capitalist — though, admittedly, it can be hard to tell the difference these days.