Premise: In the long-running BBC television science fiction programme Doctor Who and related works , the term `` companion '' refers to a character who travels with , or shares the adventures of the Doctor . Doctor Who . Doctor Who has also spawned numerous spin-offs , including comic books , films , novels , audio dramas , and the television series Torchwood ( 2006 -- 2011 ) , The Sarah Jane Adventures ( 2007 -- 2011 ) , K-9 ( 2009 -- 2010 ) , and Class '' ( 2016-present ) , and has been the subject of many parodies and references in popular culture . In the long running British science fiction television series Doctor Who , regeneration is a biological ability exhibited by the Time Lords , a race of fictional humanoids originating on the planet Gallifrey . Torchwood . A spin-off from the 2005 revival of long-running science fiction programme Doctor Who , Torchwood aired four series between 2006 and 2011 .
Hypothesis: Doctor Who is a television show.
Label: ENTAILMENT