Chris Vance, a London-born actor who has been making waves in Australia (on the prime-time medical drama/sudser All Saints), has been cast on Prison Break in the role of Whistler, a mysterious fellow inmate at the Panamanian hellhole Michael & Co. now call home. With Jodi Lyn O'Keefe and Robert Wisdom previously welcomed on board the Fox series, out of the four new roles originally announced, the only one that remains to be filled is Whistler's drop-dead gorgeous girlfriend. For more TV casting news, the fresh Ask Ausiello has breaking scoop about an X-Files alum joining The Shield.