The SGC learns that the organization of traders and mercenaries known as the Lucian Alliance is distributing a highly-addictive drug and SG-1 goes to investigate. But the situation becomes complicated when the planet's Stargate disappears, and SG-1 is held responsible.

Carter and Mitchell find themselves trapped on another plane, out of phase and invisible to everyone else. While Sam attempts to reverse the procedure, Mitchell goes after an assassin who is wiping out the Sodan.