"Captain Marvel vs Spy Smasher" - Part 1
Written by
Bill Parker (writer), Pete Costanza (artist)
Released 04/1941
From Whiz Comics #15 - When Eve is captured by Grosso under the direction of the Mask, Spy Smasher rushes to save her but is instead captured and put under the control of the Mask via his Brainograph. Now evil, Spy Smasher kills the Mask but Captain Marvel shows up to try to capture him.