On the planet Aridius the only water on display is the tears wept by its lachrymose inhabitants, who include fur star Hywel Bennett and an extra with a Doctor shaped claim to fame. But this won't be a dry affair as actor and musician Darrell Maclaine is on hand to celebrate the positive aspects of this often maligned adventure. Can Toby Hadoke discern Darrell's favourite thing about this instalment, or can he not tell night from day (in which case he isn't alone)?