In the second episode of the six-part story "Planet of the Daleks," the Doctor (Jon Pertwee) and Jo (Katy Manning) arrive on the planet Spiridon, whence the Daleks intend to inaugurate their takeover of the Universe. Having placed himself in a coma to recharge his energies, the Doctor is in danger of freezing to death. Meanwhile, Jo, determined to carry on the Doctor's efforts to stop the Daleks, is knocked out by a falling rock. Written by Terry Nation, "Planet of the Daleks, Episode 2" first aired on April 14, 1973.
by Hal Erickson synopsis