Episode 3
S19, E15: Adric manages to escape while Tegan is brought under the complete control of the Terileptil. The Doctor and Mace are taken prisoner and learn of the Terileptils' plans, while Nyssa creates a machine to protect the TARDIS.

S19, E15: Adric manages to escape while Tegan is brought under the complete control of the Terileptil. The Doctor and Mace are taken prisoner and learn of the Terileptils' plans, while Nyssa creates a machine to protect the TARDIS.