Sarah Jane sighed. This weekend was going to be a nice, normal weekend camping with her son and his two friends. Sarah Jane and Luke were almost packed; they were just waiting for Clyde and Rani.
'Where are they?' She murmured, as Luke came in.
'Aren't they here yet?' he asked.
'No,' said Sarah Jane, 'I'm beginning to get worried.'
Suddenly, the doorbell rang, startling both of them. Luke went to get it.
'We're here!' Came Clyde's voice from the hall. Sarah Jane marched in, carrying the roll of blankets. 'Sorry we're a tad late; Rani wasn't packed when I arrived.'
'Sarah Jane?' Rani asked, 'How are we going to fit all our bags into the car? We usually have enough trouble getting ourselves in. '
'I've sorted that!' Sarah Jane said excitedly, 'Come and look!'
They all trooped outside. Instead of looks of surprise, Luke, Rani and Clyde looked confused.
'What's different?' said Clyde, staring at the tiny car in the driveway. Sarah Jane beckoned them over to the boot.
'Remember how I told you how the Doctor's TARDIS is bigger on the inside than it is on the outside?' she said, 'Well, look at this!' She opened the boot and the three of them gasped.
'How is that possible?' Rani spluttered. Sarah Jane grinned.
'It's only temporary, of course. This is highly technical stuff, not even a genius like Luke could work out the theory!' Sarah Jane said. 'Mr Smith worked out the three different formulas, for three dimensions, and powered up the electric current going from him to this car. You see?' She pointed round the sides of the boot, 'Tiny crystals. They've been electrolysed by Mr. Smith to expand the area inside them. This is how the Doctor expands his TARDIS.' All three kids looked confused.
'Well, as long as it works, I'm happy!' said Clyde, chucking his rucksack in the boot. Rani went to fetch her bag that she'd left in the hallway. Soon, the boot was full to bursting with bags, blankets and tent. Rani and Clyde were cramped in the back, and Luke and Sarah Jane were in the front.