Time Ace lets gamers assume the role of eccentric scientist, Dr. Hugo Clock, who in 1914 creates a time machine with the goal of preventing World War I from happening. However, his sneaky assistant, Dr. Klaus Scythe, steals his time machine with a plan to acquire an arsenal of history's most powerful weapons in order to rule the world. Now Dr. Clock must pursue Scythe through time and prevent him from unleashing the aerial war machines of the future on an unsuspecting era.