Dipper awoke in the woods. A wolf with a chocolate pelt and a raven black splotch on its head was staring at Dipper.
"Good, you're awake," it muttered once it realized the pre-teen was conscious.
"So, let's begin wit-"
"Wait, what?" Dipper interrupted.
The wolf tilted its head.
"You do know what this means right, Doc?"
Doc? Dipper thought.
"I turned you into a werewolf."
Dipper screamed.
"Hey! Doc! Chill! You've been missing for 24 hours! We can't have someone find you in wolf form!"
"Twenty-four hours?" Dipper asked, alarmed.
"Don't worry," the wolf reassured him.
"You'll be back in the morning around sunrise. But for now, we need to train while were still wolves."
"Pardon me for asking, but why do you have to train me?" Dipper wondered.
"Well, I'm the wolf that attacked you. I'm the reason you're a werewolf. It's my pack's rule that whoever you turn, you must train."
"Last question: who are you in human form?"
The wolf was silent for a few moments. Dipper wondered if he had asked the wrong question. Eventually, the wolf cleared its throat.
"Look, my identity will remain a secret until your training is done. Just call me Mentor until then, O, Doc? Now, where do we start? How about simple hunting?"
Dipper and Mentor spent the next few hours practicing hunting squirrels. Dipper found the taste of the rodent's liver quite enjoyable to his wolf stomach, though the thought he was eating innocent woodland creates made him slightly vomit.
"You'll get used to it," Mentor said.
"But we turn back in about half an hour. Like I said, you can't know who I am, or else you could become evil.
"What?" Dipper tried to ask. But Mentor had already fled.
Dipper got as close to the Mystery Shack as he could before he turned back at sunrise.
"Dipper!" Mabel yelped, when she noticed her brother was back.
"Where were you? I was up all night looking! I was about to call the police!"
Mabel kept on blabbing on and on, but Dipper kept on thinking about what Mentor said about going evil if he knew his identity. How did that work? Dipper decided to ask the other wolf the next night.