Sub-Zero Heroes

The Sub-Zero Heroes, aka The Herd, are the main characters and protagonists in the Ice Age franchise. The group originally consisted of Manny the mammoth, Sid the ground sloth, and Diego the Saber-Tooth Tiger and would later include Ellie and add new members in each film.

The name Sub-Zero Heroes was used on promotional posters for the first film and was used again for the sequels, it should be noted that it also mentions Scrat (although he is not fully a member of the pack).

Ice Age
In the first movie, Sid, a sloth, left by his family (during the valley animals' migration), meets Manny, a grumpy wooly mammoth (who's family was recently killed by humans) and tags along with him after Manny saves Sid from two enraged Brontotherium's (out to kill Sid after he ruined their salad). Around the same time, Soto, the leader of a pack of Saber-tooth Tiger, orders Diego to capture a human baby from a tribe of Ice Age humans. The saber leader wanted revenge on these humans, since they were responsible for killing half of their pack (for food and clothing). However, when the sabers' attempt to steal the baby fails, Diego is sent to find and take the child.

Eventually Diego spots Manny and Sid, who had found the baby and were trying to return him to his family (though Manny wanted little to do with the baby). Diego tried to take the baby by convincing them that he could safely return the child to his family, an offer that Sid and Manny declined.

However, Manny eventually agrees, since Diego was the best tracker, and after several comical and dramatic side plots, and nearly getting killed by Diego's pack (after they discovered Diego was a double agent) Diego saves Manny by sacrificing himself. Though luckily Diego survives, they return the baby, and Sid, Diego, and Manny join the migration as an official herd.

Ice Age: The Meltdown
In the second movie, while trying to escape the flooding Ice Valley Manny, Sid and Diego meet two possumsnamed Crash and Eddie, and their adopted sister Ellie, a female mammoth who believes she's a possum. Near the end of the film, Ellie finally accepts that she's a mammoth, and (after everyone safely escapes the danger) she and Manny head back to the valley, with the herd, as an official couple.

Ice Age: Dawn of the Dinosaurs
In the third film, the herd meets Buck, a crazed weasel with a mammal chauvinism for hunting dinosaurs (after the herd ends up in Dino World). He appears as a scraggly mammal who wears a leaf eye patch, after losing his eye to the great, white baryonyx, named Rudy.

In the end of the film, Ellie gives birth to Manny's first daughter, whom they name Peaches. While Scrat ends up meeting his match in a female saber-tooth squirrel, named Scratte, whom he falls in love with at first sight (while they fight over his acorn).

Ice Age: Continental Drift
The herd appears once again in the fourth film, with their most recent member, Peaches, now seen as a teenage mammoth, with a molehog friend named Louis.

Sid also meets his long lost Granny (one of the main comic relief characters of the movie). Diego meets the love of his life, Shira.

Ice Age: Collision Course
A new faces show up, the young mammoth Julian who's Peaches' husband. Buck also reunites with The Herd, with his daughter, to warn them about an approaching asteroid and sets off with them on a mission to save the world. In addition, as a figment of Buck's imagination, famed astronomer Neil deBuck Weasel appears. Sid also meets the love of his life, Brooke.

Ice Age: Landscape Damage
The herd appears once again and to warn them about an tornado and sets off with then on a mission to save the world. Diego and Shira had two cubs Zang and Nina. Granny appears to rejoining with the herd along with Teddy and Shangri Llama. Also there's a new member, an eagle named Jasmine.