TV bosses are waiting to see how the new series of sci-fi adventure Dr Who goes down on BBC1.
Dr Who, which is the longest-running drama show in England, is back after a nine-year break from TV. It is one of the most popular show in BBC's history.
This time around, the Doctor is played by actor Christopher Eccleston, and his companion, called Rose, is played by pop star-turned actress Billie Piper.
The first episode is shown at 7pm on BBC1 on Saturday.
The Doctor, a time-travelling alien called a Time Lord, goes on a series of adventures with Rose as they battle against all sorts of evil monsters to save the world from destruction.