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"I hate when he gets like this." Adric grabbed Nyssa's arm. "Can you talk to him?"
"Not when he's like this," she replied, freeing her arm. "Let him be. He'll snap out of it."
Tegan added, "Sooner is better. He's driving me crazy."
The Doctor burst into the console room like a cheerful tsunami: "Get your best togs on; we're going to a party!"
"Snap," said Adric. "What happened, Doctor? You were positively morose a minute ago."
"You're my family now," explained the Doctor, explaining nothing, unless, of course, you looked past his brilliant smile into his sad, sad eyes.