Doctor Who: 10 Secrets Of The Sonic Screwdriver You Need To Know

10. It’s Not As Powerful As You Think

The most common criticism levelled at the sonic is that it's too strong, that it can get the Doctor and their crew out of any spot, no matter how implausible.

Stuck in a room? Screwdriver. Being attacked by a robot? Screwdriver. Need to whip up a three-course meal in ten minutes before your in-laws arrive? Not that this has ever been confirmed in the show, but the answer is still probably screwdriver.

It's not the complete deus ex machina that many people think it is though, as there have been plenty of moments that have cut the metallic legs out from under this seemingly faultless gadget.

In Bad Wolf, it's mentioned that the sonic can't open the deadlock seal attached to the door of the Big Brother house. Deadlock seals would return in School Reunion, The Time of Angels, and others, and have proved to be the sonic screwdriver's greatest enemy over the years.

The sonic can't open the TARDIS doors from the outside if they've been manually locked, as demonstrated when the Master did so in Utopia. And most bizarrely of all, the Tenth Doctor once revealed that his trusty screwdriver doesn't work in the presence of some hairdryers.

If only the Daleks had hair to dry, they'd have stopped the Doctor centuries ago!