Five new comedians, including Alice Levine, try to master wheelbarrow stunts and a lemon tower.
In the finale episode, the winning contestant will raise Greg's golden head.
Today's tasks include darts, eggs, and a wind-up man on a unicycle.
Sandi Toksvig embarks on the first part of her quest for knowledge with Alan Davies, Alan Carr, Alice Levine and Josh Widdicombe.
Sandi Toksvig looks at some objects and ornaments with Sarah Millican, Cariad Lloyd, Alice Levine and Alan Davies.