Cody 1 and 2

Cody 1 and 2, also known as "Cody Jrs." or simply as "Codies", are a pair of conjoined (or possible two-headed) mutant rats that Sierra adopts in No One Eggspects The Spanish Opposition while visiting the "Fun Zone" on Boney Island. She loses them in the following episode when she forced to fight their mother in the Chris' rigged boxing match, who reclaims her children.

Total Drama All-Stars
Sierra first finds Cody 1 and 2's egg in No One Eggspects The Spanish Opposition, as part of the challenge and put's in her team's basket. However it hatches and a pink, hairless rat with two heads on each end of it's body emerges, to Sierra's joy (and Duncan's shock). She immediately feels affection towards the mutant rat, and declares herself their mother. She names them "Cody 1 and 2", and is seen cradling and carrying them throughout the rest of the episode, even when it bites and atacks her. Chris and Chef who were wathcing Sierra from the monitors were highly disturbed by her behavior. It was shown that she took her pet back with her to the main island.

In the next episode, Sierra (who along with her team were staying in the Spa Hotel), is still seen with Cody 1 and 2 (though she now refers to them as "Cody Jrs"). She sees Cody 1 and 2 had escaped from their crib and hurt themselves by chewing on an electric cable. She intervenes and saves them, but they end up attacking her. She explains in the confessional that now she was a mother she was too busy to be in a relationship, and plans to drop her one-sided relationship with Cameron. Later during the challenge, each of the contestants were set to fight against an opponent in a boxing match, which was designated by the Wheel Of Misfortune. However Chris and Chef had rigged the wheel so that it would stop at a personal opponent for each of the competitors. When its Sierra's turn the wheel lands on a silhouette of a mutant two-headed rat, which she mistakes for her pet. However Chris clarifies that it was their mother. Sierra is unfazed by this and is eager to fight for the right for mothership of Cody 1 and 2. Before entering the ring Sierra 'breaks up' with Cameron, and asks him to hold onto the Codies for her, in which they later end up attacking him. When the fight commences Sierra aggresively attacks the mother, but her blows have no effect and she is clobbered, before being thrown out of the ring and landing on Cameron. The mother then reclaims her children and departs, leading Sierra to restart her relationship with Cameron (to his dismay), now that she had relinquished her motherhood.

Trivia

 * Cody 1 and 2 is the third animal to be named after a contestant. The first being Leshawna, Jr. and the second being Cody, Jr..
 * They are also the second to be named after Cody, the first one being Cody, Jr.
 * They are the third pet that Sierra has owned overall (as she mentioned that she owned several fish called Chris).
 * They are the second pet that Sierra adopts during her time on Total Drama, the first being Cody, Jr.
 * Both of which were newly hatched, and Sierra proclaimed herself to be their mother.
 * Both times she ends up losing her pet to their angered mother, who attacks Sierra.
 * Cody 1 and 2 is the fifth pet adopted by a contestant during the competition. The others being Bunny, Irene, Leshawna, Jr., and Cody Jnr.