Possible Clues:

• Killmonger's first name
• Johnson of the Colorado Avalanche
• Phantom's name
• Estrada of "Husband for Hire"
• With 38 Across, French composer
• ---- Thorvaldsson, 10th century explorer, the first European to settle in Iceland
• Leading role in 'The Phantom of the Opera'
• Killmonger who battles T'Challa
• Larson whose book 'Dead Wake' focuses on the 21 Across
• One of the Nielsen brothers