"What kind of advantage?" Sam asked, almost automatically.

"O'Neill will not side with Lord Voldemort," Teal'c said. "There is no point in-"

"He doesn't need Colonel O'Neill to be a willing accomplice," Dumbledore said. "There are ways of making someone do what you want them to without them wanting-"

"You are referring to the Imperious Curse," Teal'c interrupted.

"You've heard of it, I see," Dumbledore said.

"I have read the Histories," Teal'c told him. "I know about the various curses and-"

"What are you talking about?" Jack asked with a scowl. A scowl that was turning into a perpetual one, since he had precious little to laugh about.

"They're talking about the books, sir," Sam explained. "In the book there are three curses that wizards aren't supposed to use on others – the Imperious Curse; which makes you do whatever the caster tells you to do, the Cruciatus Curse; which is a form of torture, and the Killing Curse; which does just that…"

"The Imperious Curse can be fought off, however," Teal'c said – more to Dumbledore than to O'Neill. "All one needs is a strong sense of self – and O'Neill has that."

"We're not sure, however," Dumbledore said, as Jack looked over to Daniel to see what he was thinking about all this. The archeologist caught the look and shook his head, shrugging. He was just as lost as the colonel was. Dumbledore, of course, didn't miss this look, and he sighed. "As much as I am loath to say it, this might be far easier of the two of you had managed to read the books…"

Jack started to say something, but the door opened just then, and Minerva walked in with Sirius on one side of her and the huge, furry guy that Daniel had called Rebeus towering over her on the other.

"Sorry it took so long, Professor," the smaller man said, looking around the room and then flashing a smile at Sam. "We got held up by –"

"It's no problem," Dumbledore said, interrupting. He made a gesture with his wand and a few more chairs appeared in front of his desk. "I was just explaining to Colonel O'Neill and the others why Voldemort is interested in him."

"Pretty crappy thing to hear, huh, Colonel?" Sirius said, coming over and taking a seat next to Jack – which put him near Carter as well. "Finding out your brother is one of the most feared villains in the wizarding world must be quite a shock. Of course, I'm no better off, you know – you should hear stories about my family! Bunch of no good-"

"He's not my brother," Jack said. Again. "Why don't you people-"

"Colonel," Dumbledore said, softly. "I understand that you're having a hard time believing this, and I wish we could break it to you more gently, but there just isn't any way to. But it's true. And you need to be aware of the danger that you're in."

Jack sighed in exasperation and stood up.

"Look. I don't mean to be rude – especially to you, Minerva – but I don't know any of you and you have to admit that this story is pretty wild."

Dumbledore nodded.

"But it's no wilder than if you were some ordinary man who was suddenly being told about aliens that can take over humans as hosts and possess them, is it?"

"How do you know about that?" Jack asked, scowling, and sitting back down again. God, there was nothing he hated more than when people knew things they weren't supposed to know. Especially when they wouldn't say how they knew.

"What else do you know?" Daniel asked.

"We're wizards," Sirius said with a grin. "We know everything."

"Sirius…"

The look Dumbledore gave him was a warning, and the younger man had the grace to flush slightly.

"Sorry, Professor."

Dumbledore nodded acceptance of the apology and returned his gaze to O'Neill.

"We know because we have certain advantages that the Muggle world – with the exception of only a few – don't have."

"You can read minds?" Jack asked, sarcastically.

Dumbledore smiled and shook his head.

"Perhaps I should just show you. Otherwise, I have a feeling you will never believe us – and while I do enjoy your company, the day is progressing and we all have better things to do with our time."

He reached for a device on his desk, and touched it.

"What was that?" Sam asked, curiously. She wasn't sure what to make of everything that was going on around them, but it was certainly making for an interesting day, wasn't it? And it wasn't as though these people were threatening them or anything – and they were very convincing, although she hadn't quite fallen for their story.

"A summoning device," Dumbledore said. "But it might take a moment for a response, so I ask you to all please be patient."

Sirius looked over O'Neill at Sam.

"I can turn into a dog, you know? A cute, cuddly dog with a big-"

"Who are you summoning?" Daniel asked Dumbledore, interrupting before Jack decided to take offense at the way his second in command was being flirted with.

There was a flash of bright light in the room suddenly, and an instant later, Thor was standing in front of them. The little alien looked around the room, and his normally unreadable face was suddenly filled with surprise – actually, it was more that his large dark eyes widened – when he saw the members of SG-1 in the room.

"O'Neill…"

Jack found himself speechless – not something that happened all that often – but Daniel spoke up, just as shocked, but able to articulate a little better than Jack, whose jaw had dropped.

"Thor…"