“Attack of the Invisible Knights!”
An ancient legend involving suits of armor coming to life and destroying some opals in a museum appears to come to pass, and challenges the wits of the Caped Crusaders to discover the facts behind this legend.
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Batman #172 (1940) is issue #172 of DC's Batman (1940–2011), with a cover date of June 1965. Written by John Broome and Gardner Fox and drawn by Sheldon Moldoff.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.