Right, that sounds reasonable. You take the Doctor's hand and he takes off running down the street. "This way!" he cries. "There's a rift opened up in space and time. A crack in the universe. It's connecting Hamden, Connecticut, with another planet." His face turns serious. "A very dangerous planet. If the aliens on the other side discover the portal before you and I close it, life on Earth as you know it will end."

That's a lot to swallow. Do you want to demand that the Doctor explain what a rift in space and time is or who the aliens are and what their plan is?