High Quality Content by WIKIPEDIA articles! Mongrels, formerly known under the working titles of We Are Mongrels and The Un-Natural World, is a British puppet-based situation comedy series first broadcast on BBC Three between 22 June and 10 August 2010, with a making-of documentary entitled "Mongrels Uncovered" broadcast on 11 August 2010. A second series of Mongrels began airing on 7 November, 2011.