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Will is awakened late at night by a strange sound, but when he next hears the sound while working outside in broad daylight, he can’t ignore it. He follows it, like a siren song, to the Sleestak ruins where he sees an image of his mother. He then snaps out of it and returns home. This continues until Holly notices his strange behavior and follows him to the ruins; by touching a particular crystal that Will picks up in the ruins, she can see her mother too. But something is stopping both of them from saying anything to Rick, and it isn’t until he follows his children’s latest trance-like trek to the ruins that he realizes who is luring them there.
written by Dick Morgan
directed by Bob Lally
music by Jimmie Haskell
Cast: Spencer Milligan (Rick Marshall), Wesley Eure (Will Marshall), Kathy Coleman (Penny Marshall), Erica Hagen (Mother), David Greenwood (Sleestak), William Laimbeer (Sleestak), John Lambert (Sleestak)
Notes: Despite Enik’s claims in the previous episode that the Sleestaks in the ruins are his descendants, reduced to primitive savagery, the Sleestaks seem to have some understanding of what the crystal and the cave do to the Marshalls, as they’re lying in wait for their victims.
LogBook entry by Earl Green
Notes: Hilary Shepard comes by her musical talent naturally – she’s as much a musician as she is an actress. She’d get to sing in another unlikely genre show, guest starring in two episodes of 
On Tatooine, Luke Skywalker is occupying Ben Kenobi’s old desert hut, preparing a new lightsaber for himself – to be wielded in the artificial hand that has replaced the one Darth Vader cut off at Cloud City. A carefully orchestrated plan to rescue Han Solo from Jabba the Hutt is finally set into motion, despite Lando Calrissian and Chewbacca having seemingly vanished after coming to Tatooine themselves. Luke sends R2-D2 and C-3PO to Jabba, with orders for Artoo to play a message Luke has recorded for Jabba’s eyes only. But when Artoo plays that message, Threepio is horrified to hear Luke’s voice offering the droids to Jabba as a gift – as a token of his esteem in hopes that a deal regarding Han Solo can be worked out. Artoo is pressed into service as a waiter aboard Jabba’s sail barge, and Threepio is forced to serve as the sluglike ganglord’s interpreter. A new bounty hunter, Boussh, arrives – with Chewbacca in chains. Jabba is delighted by the new arrival and allows Boussh to stay in his palace, but the bounty hunter is not all that he – or she – appears.
The Krikkit army awaits its freedom from the slo-time envelope that has kept their entire world from being a threat – and even the seemingly peaceful people of Krikkit have fallen victim to a perverse paranoia in their isolation, preparing a doomsday weapon called the Supernova Bomb. Arthur and Ford try to hold the Krikkiters at bay while Trillian tries to negotiate reasonably with them. The Infinite Improbability Drive is recovered and returned to the Heart of Gold, and despite Zaphod offering everyone a means of escape, they’re as surprised as he is when they turn him down and opt to save the universe instead. At the core of Krikkit’s central battle computer, a massive artificial intelligence is counting down to the universal doomsday it has set in motion. And also connected to Krikkit’s main computer is another massive intelligence – a very, very depressed one – throwing a spanner into the works.
