Bruins’ ‘Behind the B’ program to debut Thursday

The promotion of Don Sweeney (left) to general manager is one angle covered in the first episode of “Behind the B” this season.Winslow Townson/For the Globe)

The third season of “Behind the B,” the Bruins’ popular television program that gives viewers a behind-the-scenes look at the team, will debut on Thursday at 6 p.m. on NESN.

Thirteen episodes are planned this season, but the schedule has not been announced yet.

Thursday’s one-hour episode will focus on all the activity of the offseason, including the promotion of Don Sweeney to general manager, the NHL draft, and other team events.