Bosk was a low-level demon and the leader of the Demonic Forty Thieves. He was known to be a very cruel demon. Bosk had hoped to find the lost city of Zanbar with the help of a genie named Jinny. However, his plans were thwarted when his genie sought the help of the Charmed Ones. He was vanquished by Jinny when she was freed from her bottle.