A huge comet speeds toward a devastating collision with the Earth, but no one will launch space shuttles filled with nuclear weapons. It's 1897. Instead, they'll fire projectiles from the Jules Verne cannon and try to deflect the comet with a gunpowder explosion. Commander Hanno Knighthead isn't sure he can motivate his argumentative, multinational crew of geniuses to work together. It turns out one of them is a saboteur. Then things get worse. Only a truly extraordinary leader could get this group to cooperate, thwart the saboteur, and jury-rig a way to divert the comet. Lucky thing Hanno brought his chewing gum.