end, Mythbusters' Grant Imahara volunteered to build Craig a robot skeleton sidekick if Craig got him 100,000 followers on Twitter. Originally, Craig provided the voice of Geoff, using a harsh, metallic voice in several short, pre-recorded phrases. Later that month, Josh Robert Thompson began providing Geoff's voice full-time. By mid 2011, Thompson would perform Geoff live in the studio. On November 16, 2010, Ferguson dedicated an entire episode to the British science fiction program Doctor Who, complete with a Dalek and guest Matt Smith. The cold open was marred when a rehearsed dance number was forced to be scrapped due to CBS not receiving legal clearance to play the Doctor Who theme song five minutes before air, much to the anger of Ferguson. The dance number later leaked on YouTube on December 1. Ferguson announced on January 3, 2011, that the dance number had finally been cleared to be shown and that it would air on the upcoming show which Alex Kingston (who plays "River Song" on Doctor Who) would guest on. On February 1, 2011, the show was dedicated to an examination of African-American history and culture in honor of February being Black History Month in the United States. Ferguson stated at the top of the show that as a recent immigrant to the country he was not very knowledgeable about the topic and would use that night's episode to educate himself. He also declared at the top of the show that there would be "no skeleton" and "no horse" during that night's taping (in reference to Geoff Peterson and Secretariat). His guests that night were Cornel West and George Clinton, who also performed "One Nation Under A Groove" with his band Parliament-Funkadelic. In June 2011, Ferguson filmed an entire week of shows in Paris, France, featuring Kristen Bell as co-host. The episodes aired during the week of August 1. Ferguson joked, "It's the first time in the history of this show that we've been allowed outside." For this week of shows, the program was temporarily re-titled Le Late Late Show avec Craig Ferguson à Paris, and Ferguson sang the show's theme song on-camera with help from two Parisian musicians: one playing a piano, the other a double bass. On August 23, 2011, Ferguson received a white substance in the mail that was feared to be anthrax. Many people were held in isolation after being exposed to the substance,