Who were those strange masked outlaws?

"Yessiree, Sheriff - it was Black Hat George and the Nursery Gang alright. They-all done come through here a-hootin' an' a-hollerin' - makin' a terrible ruckus. Makes it awful hard for a feller to get his work done, and that's a fact.

"Last I saw 'em, they was headed for the garden, Sheriff. You can't miss 'em - three of 'em are dressed as reg'lar cowpokes, but the fourth is Spiderman."