Lion Visual Effects, Inc.
From Tardis Wiki, the free Doctor Who reference
Lion Visual Effects, Inc. was in charge of visual effects on Torchwood: Miracle Day. According to their show reel, they were responsible for the memorable pathology scene in The New World, amongst many other shots.
Formed in 2008, they have worked mostly on television series. Prior to Torchwood, their main credits were for Criminal Minds and the Kelly A Manners-produced Dollhouse.