During 2013, Kiske took part in the Avantasia album The Mystery of Time, singing on the songs "Where Clock Hands Freeze", "Savior in the Clockwork" and "Dweller in a Dream".
Το 2013, ο Κίσκε συμμετείχε στο πέμπτο άλμπουμ των Avantasia The Mystery of Time, τραγουδώντας στα τραγούδια "Where Clock Hands Freeze", "Savior In The Clockwork" and "Dweller In A Dream".