The crew is infected with a mysterious disease that removes people's emotional inhibitions to a dangerous degree. unfold>> << fold

A transporter malfunction splits Captain Kirk into two halves: one meek and indecisive, the other violent and ill tempered. The remaining crew members stranded on the planet cannot be beamed up to the ship until a the problem is fixed. unfold>> << fold

The Enterprise is thrown back in time to 1960s Earth. unfold>> << fold