Synopsis: The First Doctor, Ian, Barbara and (an unseen) Vicki, land on the planet Seetar. They encounter a tribe of savages. A giant wormlike creature elevates from the sand, and the tribe begin to worship it. Sensing Danger, Ian pulls a cricket ball from his pocket and lands a throw on the beast's eyestalk. The creature cowers away in fear.
The savages now wish to worship the Doctor and Ian. At first the time travelers give into the celebrations, especially since a tasty dinner is on offer. But when the celebration turns a bit too religious, and a virgin sacrifice is added to the menu, Ian and the Doctor protest. They return to the TARDIS and a waiting Barbara.
Later, the Seventh Doctor lands on Seetar. He finds that an altar has been made in Ian and his image. Another virgin sacrifice is on offer—one he again has to stop.
Synopsis: The Doctor and Leela materialize on Shontaa, in hopes of a good picnic. Unfortunately, they discover Zygons at play. Two Zygons in particular are engaged in a to-the-death shape-shifting contest. The only problem is that in order to shape-shift, the Zygons must have the original bodies in captivity nearby. So this contest is jeopardizing innocent lives.
The Doctor purposes to end it. He does so by having Leela "handle" the guards, after which he can enter the Zygon's space ship. Inside, he's able to free the bodies held in stasis, forcing the Zygons to revert to their natural state.
Outnumbered by the Doctor, Leela, and the now-free captives, the Zygons are forced to relent and take the ex-hostages back to their rightful homes.
The Doctor and Leela can now continue their picnic in peace.