We’ve ranked five alien movies that the award-winning filmmaker Steven Spielberg has ever directed.

Breathless and occasionally baffling, the plot of “Disclosure Day” is hard to summarise, but here goes: nuclear conflict looms in America.

Disclosure Day, based on an original story by Spielberg, centers on a decades-long government conspiracy to cover up the existence of alien life, and the group of defectors intent on releasing that in...