The Ordovician Organisms (South Park)

The Ordovician Organisms is an upcoming South Park episode which features the paleozoic ancestors of the modern day characters.

Premise
475 million years before the events of Cartman Gets an Anal Probe, the single-celled organism/amoeba ancestors of Cartman, Stan, Kyle, and Kenny are living beneath the Pacific Ocean during the Ordovician era. In the beginning of the episode, they hatch from eggs at the very bottom of the Mariana Trench, but as the episode progresses they attempt to make their way to the Great Barrier Reef, but as they begin their odyssey they encounter many marine beings that threaten their lives such as giant squids, angler fishes, pacific viperfishes, giant spider crabs, six-gilled sharks, stingrays, etc. They once even hide in a brine pool to hide form predators out of desperation. Despite never meeting anyone else but themselves, the four organisms were biologically wired to seek out their friends and family, and they eventually make it to the reef and unite with them. In the last five minutes of episode, the four main characters begin to follow an amphibian creature in the ocean, and it had just evolved from a form of fish. The amphibian then made its way to the surface, with the four main characters clutching onto its tail, with all the organisms following their lead. The organisms then evolved into humanoids that strongly resemble their modern descendants, and then crawled onto land with the amphibian leading the way, until it is crushed by a Tyrannosaurus.

Trivia

 * The 2D hand-drawn animated sequences for when the characters were underwater were produced by both Neko Productions in Burbank, California and South Park Studios. The episode combines traditional animation with computer animation for when the characters move onto land.
 * The animation also bears a striking resemblance to the cartoon segment in the opening scene of the "Minions" movie.
 * When the characters were underwater, they communicated using American Sign Language and conveyed using visual clues.
 * The characters were omnivores, meaning that they ate both meat and plants. Their herbivorous diet consisted of seaweed, seagrass, kelp, algae, sea grapes, halimeda, etc. They also ate a variety of fish, such as salmon, herring, and sardines. They also ate squid, octopuses, shrimp, krill, jellyfish, mussels, clams, scallops, shellfish, crabs, lobsters, prawns, oysters, and barnacles. They were also scavengers, consuming dead carcasses when available, such as plesiosaurs and sea dinosaurs. Their favorite meals however were seals, walruses, and right whales. This is because these animals possessed nutritious insulating layer of blubber, which was a rich food source for the main characters and this would provide them several days worth of energy.
 * Years are actually going by while the characters are beneath the sea, and they change size many times throughout the story. When they first hatch from eggs in Challener Deep, they are are about the same size as plankton, and when they grow fins, they are about the size of of a pygmy seahorse, but slightly smaller, and hence why Cartman's ancestor was able to fit in the pouch of a sea horse. When the characters grow hands and feet when they reach benthic waters, they are about 4-7 inches tall. When they leave the ocean, they grow to their typical size for South Park characters.
 * When the characters were underwater, they possessed several abilities that helped them survive:
 * Glowing in the dark: When the main quartet characters were in the hadopelagic, abyssal, and bathypelagic zones, they had possessed a natural phenomenon that allowed them to glow in pitch-black conditions and help them navigate in total darkness. This is called bioluminescence.
 * Asexual reproduction: The main characters were shown to rapidly regenerate their limbs and reproduce by "budding". One example was when a angler fish bit off one of prehistoric Kyle's arms, and he regenerated his lost arm in a matter of seconds.
 * Camouflage: The characters had the special power of camouflage to be able to blend into their surroundings, which was very helpful to use when hiding from predators.
 * Echolocation: In juxtaposition with bioluminescence, another way the main characters navigated in pitch-black conditions were echolocation. They had developed the ability to use echolocation, often known as sonar, to help them see better underwater. They also used this ability to locate both predators and prey, and this trait is achieved by sending out a from the mouth. When the sound waves hit an object they produce echoes. The echo bounces off the object and returns to the characters ears.
 * Shapeshifting: The main characters were also shown to shapeshift, allowing them to morph into different shapes and can also disguise themselves as any person they want. They can also mimic the sounds of the animal they shapeshift into.
 * Enhanced Senses: The characters had very sharp senses. This power is seen when they hear the faint screams of a predator miles away from them. Also they rapidly noticed the presence of another being in a brine pool, which was an electric eel.
 * Speed and Agility: The characters were shown to swim at great speeds, even once appearing to have caused a sonic boom when taking off. They used their speed in conjunction with their acrobatic skills, allowing them to escape rather brutal confrontations with little difficulty.
 * Strength: The characters were shown to be tremendously strong for their size, cable of holding their own against other larger organism species. They were shown to carry heavy objects, such as boulders and branch-like materials. When swimming at full speed, they easily knocked back multiple fish.
 * Stamina and Endurance: The main quartet were shown to swim for very long periods of time without signs of fatigue. Their bodily tissue is substantially harder than regular organisms that gave them some degree of invulnerability.
 * When the characters emerge out of the sea, they communicate solely with grunts and growls. This is due to humans not developing a language system until about two millions years ago.