Russell is taking on this challenge to raise money for Meadow House Hospice, the NHS-funded facility which cared for Lis earlier this year.
"Like many of her fans and friends, I was deeply saddened by Lis' death in April 2011 and I hope to raise as much money as possible for this wonderful cause.
Starting on Saturday 3 September, I will walk from the BBC's Upper Boat studios in Cardiff (where The Sarah Jane Adventures was filmed), aiming to arrive at the BBC Television Centre (where Lis first filmed Doctor Who) in London the following Friday. I will largely be following the National Cycling Route No. 4 - walking the equivalent of a marathan every day!"'
(Edward Russell with Elisabeth Sladen)
You can donate to this wonderful cause at Just Giving- Walk for Lis and follow his progress from his blog, walkforlis.
From all of us here at SarahJane.tv: Good luck, Mr. Russell!!!