Delta Lock
The girls learn how to perform the "Delta Lock", a combat maneuver which traps the enemy WORM into a field where its cells collapse and can be destroyed. They also experience their first combat with a real WORM. Karen gets shot down and suffers a concussion and sprained arm.
Aired 31/08/2007EP 9 - Delta Lock

2007
Sky Girls
In the near future, Earth is at war with aliens called Worms. The war leaves the population of Earth decimated, with young men the main casualties. The Worms were beaten back but their re-emergence heralds the creation of a mecha unit called the Sonic Divers, piloted by 3 young girls to counter this threat.