Possible Clues:

• Mr. Estrada
• ''Flying Dutchman'' role
• The Phantom of the Opera's first name
• 'The Phantom of the Opera' lead role
• Estrada of TV fame
• Larson whose book 'Dead Wake' focuses on the 21 Across
• ___ Killmonger, 'Black Panther' villain
• Killmonger in "Black Panther"
• Killmonger's first name
• Johnson of the Colorado Avalanche