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The “Shadowhunters” cast continues to grow. ABC Family announced Friday that Matthew Daddario and Isaiah Mustafa will join the supernatural saga series.

Daddario (“Delivery Man”) will play Alec Lightwood, another hunter of demonic creatures. His romantic feelings for his friend and fellow hunter are a source of strife for the teen.

Mustafa (“Horrible Bosses”) will play NYPD detective Luke Garroway. Formerly a powerful Shadowhunter, Garroway must deal with his new life as a werewolf pack leader.

The duo join Katherine McNamara, who has been cast as the lead; Dominic Sherwood, who will play Jace; plus Alberto Rosende and Emeraude Toubia, who will play Simon and Isabelle, respectively.

The series is based on the bestselling series “The Mortal Instruments” by Cassandra Clare. Protagonist Clary Fray (McNamara) must adjust to the revelation that she descends from Shadowhunters, human-angel hybrids who track down and eliminate demons in a world populated by other supernatural creatures.