Nanny Balloon Zombie

Nanny Balloon Zombie is like a Balloon Zombie carrying an Imp.

Strategy
Just use Cactus or something else to pop balloon, then use Pumpkin to protect plants.

Trivia

 * Except spike, other projectiles will hit the Imp first, then Balloon Zombie.
 * Ground projectiles cannot hit the Imp while flying, even the splash effect (except exploding plants will kill both).