Building Bridges

A team-building exercise is under way to demonstrate the power of teamwork. The teams of four have to follow a series of clues and build a bridge with the parts they find. The ineffectual Miss Bettany is shocked to realize she's messed up with the clues, and both red and yellow teams are racing for the same location. Meanwhile, Alex is struggling with the pressure of exams: Sammy introduces him to Tai Chi.