The Haunted Shipwreck
Written by
Don Segall (writer), Ray Bailey (artist)
Released 08/1966
From Undersea Agent #4 - 14 pages - Skooby and his dolphin friend come upon an intact sunken wreck but one with its indoor lights aglow. It is really just a doorway to a tunnel to the underground lair of General Zomba who has an army of "mindless one".