It's time to meet Daniel's grandfather in Crystal Skull! No, not the Indiana Jones movie. And just like every sci-fi show where someone is "invisible," what exactly are the rules of that? Did you know there are flavors of leptons? There are so many excellent quips and one-liners this week. The way Nick plays being able to hear and see Daniel but not believing Daniel is actually there is just fantastic. Why are SG1 skeptical about the giant aliens existing when they deal with aliens on a daily basis?

And stay tuned to the end for an outtake!