The very first episode of Doctor Who I ever saw (“The Seeds of Doom”) opened with Elisabeth Sladen frantically digging around in snow, trying to find the Doctor.
And it was so wonderful to see her back in The Sarah Jane Adventures, where her part was such a great counterpoint to typical television heroes (young and male). She was an action hero at an age when most actresses have to play the nurses in Shakespeare plays or the grandmother.
She died of cancer today at the age of 63. Very sad.
Photo by Danacea on Flickr; used under a Creative Commons license.