Hi, just throwing in my two cents, it's a lot easier to get the guy in the bomb room to pick up your gift if you scare him about halfway first, otherwise that walkthrough posted earlier is exactly how I did it.
Just been playing this one again. I've actually found it easier to completely ignore Murray and scare off the rest first of all.
Used Hogwash to disable the wards downstairs - then Darkling, Firetail, Moonscream, Buck and Static to scare off the mortals downstairs. Take care with Darkling's use of obession.
Afterwards just left Wisakejak to create a trojan gift, Hogwash and Darkling attached. Obession and fascinate (from Wisakejak) to get Murray to pick it up.
Firetail disposed of the Ice Cream Monster and Stormtalon completed the roster, though never saw action.