The Doctor grinned. "I like your spirit. But the bus is our only way back, and its wheels are buried. We need power, we need lift, and we need it before that swarm hits."
"The bus needs to fly," the Doctor muttered, sweating over a nest of wires. "I'm rerouting the gravity compensation from the wormhole's wake. Christina, I need your jewelry!" [S0E13] Planet of the Dead
to other "one-off" companions like Astrid Peth. The Doctor grinned
"They tear a hole in space, eat the world until it's a desert, and then move to the next one," the Doctor explained, his eyes widening. "And that hole leads straight back to London." We need power, we need lift, and we
They raced back to the bus. While the Doctor reconfigured the engine using his sonic screwdriver and Christina’s stolen trinkets, the passengers stepped up. Nathan used his knowledge of structural engineering to help brace the chassis, and Angela kept everyone calm, distributing what little water they had.