The Third Doctor has been wounded after being shot by the Master on the Ogron planet. Jo helps the Doctor into the TARDIS, where he sends a message to the Time Lords before he collapses. Delirious, he falls into a coma. Jo dictates into the TARDIS log that she has seen this healing state before ("The Dæmons"), and that the TARDIS is moving, being controlled remotely by the Time Lords. When the TARDIS comes to a stop, Jo activates the external scanners to see some plants outside block the viewer by spraying a thick sap-like liquid at it. With the Doctor still catatonic, Jo leaves the ship to explore the surrounding jungle. The plants spray sap on her as she walks by, and a bit of it gets on her hand.