It was in 1988 against the Sea Eagles, who won the premiership the year before. The match was at Lang Park, Brisbane (now Suncorp Stadium). As you can see, the stadium was very different back then. Wayne Bennett was the Broncos coach. Wally Lewis was the Broncos captain.
Broncos v Sea Eagles | Round 1 1988 | Classic Match Highlights | NRL
Broncos v Sea Eagles | Round 1 1988 | Classic Match Highlights | NRL