The Biggest Loser returns with a bang for season 13 when the contestants arrive at the ranch and get one of the biggest surprises ever in the series' history. They arrive in teams of two -- including mother/daughter, father/son, brother/sister and husband/wife, all eager to change their lives together. But they're shocked to discover that they will not only be split up -- they will also be competing against the person they came with. They'll be pushed out of their comfort zones in a way they have never been before -- and one team won't even make it on to the ranch -- as the season of No Excuses begins. The players all have different excuses for why they never lost weight before. So the season of no partners will also be a season of no excuses -- as week in and week out, all the typical reasons for not getting in shape will be addressed. Alison Sweeney hosts the series, and trainers Bob Harper and Dolvett Quince also star.