New story.
GOOD LINE: Shaggy reacts, in typical fashion, to the sudden appearance of the ghostly Confederate general:
SHAGGY: "Like, take cover, Scoob, before the South rises again -- FROM THE GRAVE!"
The title, written across a "floating scroll" at the top of the opening splash panel, actually reads: "In Museum Mayhem" - as if the name of Scooby-Doo (or a Scooby-Doo logo) would have preceded it, making it "Scooby-Doo in Museum Mayhem". This is not an error or omission made in reprinting this story, as it also appears this way in the original printing in Scooby-Doo (DC, 1997 Series) #122 (September 2007).
The extreme brevity of this story (4-pages) gives the phantom conquistadors - and the very plot itself - no buildup whatsoever. They appear in only FOUR PANELS, the opening splash and a three-panel denouement - and are not even named as such. Again, the original printing is no different, leaving one to believe that the story was modified to some degree during the creative or editorial processes.
Fred is in his "ascot-less" outfit, as seen in the TV series What's New, Scooby-Doo? (2002-2006), as this story was influenced by the run of that series.
The art and coloring in this story are a considerable cut above the norm, however there are one or two spots where a disconnect seems to occur between writer and artist:
Page 6, panel 5: In order to rescue Scooby and Shaggy, Fred needs to move from the ground to the basket of one of the racing balloons in a hurry:
FRED (on the ground): "Airboy! [sic] Throw me a rope!"
Page 7, panel 1: With no indication of any time-passage, Fred has already completed a dangerous through-air-and-over-water maneuver that would be an effort even for a character like Batman, and is aboard the balloon already in action. Something looks like it is missing, if but a single panel of transition.
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Page 10, panel 1: A far greater, inexplicable disconnect occurs when Bobby Bluster (the promoter of the event who [SPOILER ALERT] is INNOCENT) is taken into police custody with the treasure hunting looters disguised as the zombie air pirates. Bobby's hands are behind his back, indicating that he is cuffed, with an angry expression and an open mouth for which there is no dialogue balloon. Nothing in the story as-published implicates Bobby in the zombie-pirate plot, yet he's ushered away with the other criminals.
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GOOD BIT: In a tight spot, Shaggy is uncharacteristically calm and optimistic... albeit briefly:
SHAGGY: "Like, Scoob, I know we're over 1000 feet in the air, on top of a zeppelin, with zombie pirates climbing up to get us... But listen, man -- don't panic! We've been in WORSE SPOTS."
SCOOBY: "Ro re raven't." ["No we haven't." - in Scooby-talk].
SHAGGY: "We haven't?! HELPPPP!!!"
And even here the writer-artist disconnect manifests itself, as the zombie-pirate blimp is NOT beneath them... but is COMING TOWARD THEM AT A DISTANCE!