Syfy said Monday it has acquired the exclusive U.S. broadcast rights to the \"Dr. Who\" spinoff, \"K9.\" The show will have its American premiere on the channel with a full-season marathon Dec. 25. \"K9\" follows the adventures of the robotic canine created by British writers Bob Baker and Dave Martin and first seen in the original 1978 BBC TV series, \"Doctor Who.\" \"The show mixes live action with stunning CG and special effects and pits the robot dog K9 and his teenage friends against a number of human and alien adversaries,\" Syfy said in a news release. John Leeson, who voiced the original K9 character, lends his vocal talent to the dog in the spinoff, as well.