Soward will partner Rangi Chase in the halves and Thorby will come from the interchange in a reshuffled Dragons team.
Unavailable Dragons are: Mark Gasnier (Pectoral), Wes Naiqama (Knee), Dean Young (Knee), Ben Hornby (Calf), Brett Morris (Shoulder), Ashton Sims (Knee) and Jason Ryles (Knee) and Tom Hewitt (Hamstring).
NRL Dragons v Brisbane Broncos 7.30pm Friday 1 June Oki Jubilee Stadium
Coach: Nathan Brown
1. Josh MORRIS 2. Jason NIGHTINGALE 3. Beau SCOTT 4. Matt COOPER