In "Elsewhen", an adult version of Holly visits via a time doorway from the future, and in another episode a mysterious "repairman" confidently predicts that the Marshalls will someday escape the Land of the Lost.
The Marshalls encounter him when they attempt to ride the river out of the Land in the episode "Downstream", but he ultimately returns to his cave rather than face the dinosaurs in the jungle outside.
The original script for "Downstream" called for him to have a rifle, but concerns over young viewers being inspired to play with firearms resulted in its substitution with a cannon.
In "Elsewhen" she arrives through an open time doorway in Enik's cave to give aid to Holly after she runs off and leaves her family in one of the lower caverns.
Rani appears to be in her early to mid-20s, with shoulder-length blonde hair and wears a simple yet elegant gown made from a pale blue fabric.
Holly finally realizes who she is after she receives a fresh scar identical to Rani's while fighting the Sleestak "god" in order to buy time for her father to haul an injured Will up and out of the pit.
Peter Koenig was a private in General George Washington's Revolutionary Army who arrived in the Land of the Lost some time prior to the Marshalls.
Beauregard Jackson (Ron Masak) of Fort Worth, Texas is a hypersonic glider pilot from 20 years in Earth's future relative to when the Marshalls became trapped in the Land of the Lost.
His umbrella acts something like an air conditioner keeping himself and Uncle Jack cool during the sweltering heat of increasing solar flare activity.
Pakuni (singular: Paku, though this usage is not consistently obeyed) are a species of small ape-like humanoids, ground-dwelling and bipedal, but not fully upright in posture.
Subsequently, Cha-Ka forms a close friendship with the family and with Holly in particular, helping them whenever possible and occasionally visits the Marshalls in their cave in High Bluff.
Cha-Ka's moments range from his attempt to undergo the rite of adulthood to facing a mysterious being who saw him worthy of advancing on an intellectual level, resulting with his gaining the ability to speak near perfect English, play an alto recorder-like wind-instrument, walk and run upright, and learn to make fire by Season 3.
Sleestak are devolved green humanoids with both reptilian and insectoid features; they have scaly skin with frills around the neck, bulbous unblinking eyes, pincer-like hands, stubby tails, and a single blunt horn on top of the head, and bear a resemblance to the hypothetical "Dinosauroid".
(According to Wina Sturgeon's original story for "The Hole", the Sleestak ate bugs as a regular part of their diet and used a special drill attachment for their crossbow bolts to dig them out of trees.)
[12] Physically, the Altrusians were similar to Sleestak, with the former marked by a shorter stature, their smallest claw or "finger" placed adjacent to the others on the hand, and a golden yellow skin tone.
The Altrusians possessed advanced psionic technologies based on light crystals and understood a great deal about the operation of the Land of the Lost.
He initially believes himself to be in the distant past, but upon discovering the ruins of the Lost City, he theorizes that his people degenerated into modern Sleestak when they failed to control their hate and anger.
Rick Marshall speculates that it was not the presence of hate that doomed the Altrusians, but rather the absence of compassion; Enik considers this to be a cogent argument and plans to return to his people to warn them of this flaw in their philosophy.
He introduced himself as being one of the "keepers of the time portals" although it is unclear if he is referring to a select number of Altrusians tasked with that responsibility or his entire race.
As such, he is equipped with a piece of Altrusian technology called a Magetti, a large crystal suspended in a tetrahedral frame that Enik describes as a "divining rod" that can be used to locate and fix dimensional doorways, determining where and when they would open.
The Magetti has a self-destruct mechanism that is triggered when its user experiences sufficiently strong hostile emotions; this is a built-in safeguard to prevent it from falling into violent hands.
Will Marshall inadvertently destroys it and forces Enik to rely on a different and less-suitable device (a "companion piece" to the Magetti that is worn around his neck as a pendant) to continue his efforts to return to his own time and warn his people of their fate.
Enik is quite contemptuous of the current state of the Sleestak since the fall of the Altrusian civilization, though he feels compelled to aid them because they are his future, albeit contemptible.
This garment was added to his costume when the wetsuit Enik's skin was crafted from shrank after rubber scales were glued to it, requiring slits to be cut across the front in order for Walker Edmiston to fit inside.
As noted in an audio commentary on the DVD, the spelling was changed to Enik (reverse of the Greek root word for "cinema") by David Gerrold, before the episode "The Stranger" was taped.
Many episodes refer to or take place in Enik's cave, which contains a time doorway and lies near the Sleestak god's pit, and is accessible through the central of the three entrances into the Lost City.
The Zarn is a humanoid alien who is invisible except for white spots of light scattered over his surface; he doesn't even leave footprints when he walks on soft soil.
The Land of the Lost's megafauna consists primarily of dinosaurs; genera noted included Coelophysis, Tyrannosaurus, Allosaurus, Triceratops, Brontosaurus, Styracosaurus, Ankylosaurus, plus the non-dinosaur Pteranodon.
Holly speculates that Grumpy continued to return due to the large quantities of a ground-hugging fern-like plant she dubs "dinosaur nip" that grows in the area.
[6] An Allosaurus, Big Alice dwells around the Lost City and is referred to by the Sleestaks as "Selima", meaning "Protector" in their language due to her role in keeping predators away from their eggs.