The TARDIS materializes on Spiridon, a dense jungle world shrouded in mystery. The Doctor lies unconscious, but not before requesting the Time Lords guide their ship to pursue the Daleks through the cosmos. Alongside his companion Jo, he must uncover why the Daleks have established their sinister base on this alien planet—and what terrible plans they're hatching involving invisibility technology and a devastating biological weapon.
Director: David Maloney
Writer: Terry Nation
Stars: Jon Pertwee, Katy Manning, Bernard Horsfall
Director: David Maloney
Writer: Terry Nation
Stars: Jon Pertwee, Katy Manning, Bernard Horsfall