The BBC has released a short teaser for the forthcoming special episode of The Sarah Jane Adventures due to be shown as part of Red Nose Day 2009.

The charity telethon, organised by Comic Relief, will be shown on BBC One this Friday. The charity aims to raise money to help poor, vulnerable and disadvantaged people throughout the world's poorest countries as well as in the UK.

The show begins at 7pm UK time and the first hour will be part hosted by David Tennant. This hour will feature the special episode of Sarah Jane staring Elisabeth Sladen and guest star Ronnie Corbett.

The episode is written by Gareth Roberts and Clayton Hickman and also stars Tommy Knight, Daniel Anthony and Anjli Mohindra.

The Sarah Jane Adventures website contains a number of images and wallpapers based on Red Nose Day.

The video may not be available outside the United Kingdom.