Prepare for fierce aerial combat with aircraft that span the years since the dawn of aviation! Your timeship's first encounter is with ancient 1910 biplanes; you're outnumbered, but your weapons are superior. Eliminate the entire air fleet; then knock out a mighty zeppelin and progress to the next stage: 1940 World War II fighters. If you defeat them, you'll move on to 1970 helicopters, armed with homing missiles. But the toughest dogfight is the battle with sophisticated jets from 1985. Will time be on your side ?