Big Jet is a blue fighter plane, who is the nemesis of Rocket and the Little Einsteins. Big Jet has been known to ruin parties, and steal things to keep for himself. Big Jet hates springtime, owing to his being allergic to flowers, as seen in the episode "O Yes, O Yes, It's Springtime". He also hates losing, as seen in "The Great Sky Race Rematch". In episode 64, "Show and Tell", Big Jet became friends with Rocket and the Little Einsteins. Big Jet is depicted with yellow horizontal stripes on his vertical stabilizers.