Sarah Jane pushed Luke and his friends forward, nodding towards the Doctor to get them back to the car. She needed to close the door and fast. The Slitheen was gaining.

She changed the setting on her sonic lipstick and held it out. Hah, just in time! She grinned in grim satisfaction as she stepped backwards to lock the outer doors as well. Just to make sure they had enough time to get away, she melted the interior of the lock with the lipstick.

Then, she rushed to join the others.