Doctor Who sceneario
Mine: K9, Sarah Jane Smith, Nyssa
I would also suggest Ian, Liz, Harry,Romana, and Thurlough but that would be cheating ;).
Lists of companions if stuck can be found here.
Tagging: Kerron, Jo, Lola, Tim, Dunadan, Lisa Rullsenburg, all the Andrews.
(In a bit of a rush to do links there, but they know who they are! ;) )