In the pilot episode of “BBC America’s The Nerdist,” Chris Hardwick and his co-hosts Jonah Ray and Matt Mira get nerdy in a round-table discussion of gadgets, “Doctor Who” and more with guests Matt Smith (“Doctor Who”) and Craig Ferguson (“The Late Late Show with Craig Ferguson”). Chris’ longtime collaborator Mike Phirman of “Hard ‘n Phirm” performs as the show’s one-man band.