The Pantheon
From Tardis Wiki, the free Doctor Who reference
The Pantheon of Discord was a group of aliens who craved to impress reality and cause chaos. The Trickster was a known member. (SJA: The Wedding of Sarah Jane Smith).
In The Satan Pit The Doctor states that there are many demons to choose from within the same pantheon.
In Turn Left The Doctor tells Donna about the creature being of the Trickster's Brigade. It is unknown yet if the creature was part of the pantheon.
In The Wedding of Sarah Jane Smith The Doctor states that The Trickster was removed from the Universe. Also Sarah Jane Smith states that The Trickster can only appear when someone is about to die, it is not known if this is for the entire Pantheon of Discord
