What's left of the human race continues to rage against the machines in Terminator Salvation (2 out of 4 stars).

But without Arnold front and center, the heavy-metal fracas is just not much fun. Christian Bale stars in this lackluster fourth installment in the Terminator series, but his Batman-Terminator crossover doesn't work. Things do explode well, and loudly. The machines are bigger, shinier and meaner than ever, and the world they inhabit is even more grim and bleak. But the dramatic elements flat-line; any kind of humanity is in short supply.