Bloorm Vungah Bart Gossimar Day Slitheen was a female member of the Slitheen family. She is married to Dax Fex Fize Gossimar-Day Slitheen and the Aunt to Korst Gogg Thek Lutiven-Day Slitheen

Bloorm, her husband Dax Fex Fize Gossimar-Day Slitheen and Korst Gogg Thek Lutiven-Day Slitheen got a message from the Xylok to Kidnap help destroy earth and get revenge after some Slitheen family members were killed by Sarah Jane Smith, Maria Jackson, Clyde Langer and Luke Smith

To Prepare for their Plans, They stole a technology from The Blathereen that made them able to use Skin Suits of Slim Humans and control the gas exchange. When they arrived at Earth, Bloorm and Dax Killed June and Marco Goss in their sleep and Bloorm used June Goss's Skin to disguise herself under the alias of Heidi Stafford

Eventually, Bloorm and Dax teamed up with Sarah Jane to stop themselves from being crushed by the double-crossing Xylok, Mr Smith. In the end, they left Earth. (TV: The Lost Boy)