Kaskade will be in the DJ booth when Super Bowl LVIII kicks off on Sunday ... stepping in at the last minute to replace Tiësto, who backed out of the gig due to a sudden family emergency.
As we previously reported, the "Godfather of EDM" was originally set to spin tracks throughout the entire game ... but was forced to return home hours before the Kansas City Chiefs and San Francisco 49ers take the field.
TMZ Sports has learned .