 After Sam and Dean fail in their attempt to kill the Devil, Castiel teleports them to safety.After exhausting most of his remaining power to take Sam and Dean back in time to save their parents from renegade angel Anna, Castiel aids the Winchesters in their battle with Famine, the Horseman of the Apocalypse – the brothers having already defeated War – but his weakened powers render him susceptible to Famine's influence, Famine attacking Jimmy's hunger for red meat to make Castiel more interested in eating burgers than actually fighting.When the brothers are killed by vengeful hunters in "Dark Side of the Moon", Castiel – unable to return to Heaven – briefly communicates with them.