Doctor Who star Karen Gillan is probably wishing she had a Tardis handy - now that she's stuck in America because of the ash cloud.
Thousands of flights were cancelled because the ash from a volcano in Iceland could damage planes' engines.
Karen was promoting the new series of Doctor Who in Los Angeles, and now she's waiting for a flight home.
"There are worse places to be stuck so I'm having a nice time," the actress told The Metro newspaper.
Karen will now have to join hundreds of other passengers who are stuck abroad, who are waiting to be told when they can fly home.
Amy in epsiode one
While she's there, Karen's been chatting about her new role.
Being Doctor Who's assistant might be one of the most sought-after jobs in TV, but it's not exactly glamorous, she said.
Karen's had to do lots of crazy things during filming, and her strangest moment so far was "lying in a pool of sick with cabbage in it".
"That was the most bizarre," she added.
Karen with Matt Smith on set
She also said how great it was working with new Doctor, Matt Smith, who can be quite unpredictable.
"He's great to work with, you never know what's going to happen from one take to the next, so I don't know what's coming," she said.
Doctor Who boss, Steven Moffat, is also stuck in America.
He said that fans had a treat in store as the series is about to get even scarier.
A Weeping Angel
This Saturday's episode sees the return of the Weeping Angels - terrifying concrete monsters who can kill you if you blink in their presence.
"I think it's one of the scariest ones we've ever done. My little boy says it's the scariest thing he's ever seen in Dr Who," he said.
Ooh! Can't wait.