Living in the Shadow of World War II (2018)

S1E5 Several Leagues Above the Sea

The sinister inventor's twin sibling creates a "Grand Flying Contraption" in hopes of winning Bubbie's affection. Unfortunately, Bubbie views him only as a friend and doesn't reciprocate his feelings, leaving him heartbroken. His sorrow inadvertently puts Flapjack and his friends in peril as they get caught up in the unfolding chaos.