The New Adventures of The Wild Thornberrys: Invasion of the Thornberrys

Invasion of the Thornberrys is the one-hour special and the season finale of The New Adventures of The Wild Thornberrys.

Summary
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A brutal battle between the Australian animals and their extraterrestrial clones erupts, although Darwin refuses to fight with his own clone resorting to slapping him (Irwin's clone also seems to refuse to fight, causing the original Irwin to ponder on what the two sides have in common).

The Thornberrys are unable to bear this senseless violence, even while Jack and Z grow tired but continue fighting. In an attempt to put an end to the ordeal, Z sums up all his remaining power for one final duel. However, just as he opens fire, Eliza runs between Jack and Z in a brave attempt to stop the fight. Z's attack hits Eliza, killing her.

Darwin and Irwin runs to Eliza's side and tries to wake her up. Darwin tries chest compression (chimpanzee style) on Eliza, while other animals, Debbie, Donnie, Nigel, and Marianne look on. After several attempts to revive Eliza using chest compression, Darwin grows tired and stops. Realizing that Eliza is dead, Darwin and Irwin starts crying for their fallen friend, the other animals doing the same. Their tears all gather together and eventually reach Eliza, their mystical healing powers bringing her back to life. Overjoyed, Darwin and Irwin leaps into Eliza's arms as the three embrace, happy to be reunited once again.

As everyone rejoices, Z, taken aback by Eliza's act of selflessness to save all the animals, has an epiphany over the relationship between man and beast, and realizes that the circumstances of how one is born should not be allowed to divide anyone. He leaves with his henchmen and the cloned animals, erasing everyone else's memory of the horrifying incident, knowing it is for the best.

Eliza and her family find themselves back at the gas station with no idea how they got there. Eliza looks up to the sky and spots Z flying past.

Main Cast

 * Lacey Chabert as Eliza Thornberry
 * Tom Kane as Darwin
 * Jason David Frank as Irwin
 * Flea as Donnie
 * Jason David Frank as Irwin
 * Danielle Harris as Debbie Thornberry
 * Tim Curry as Nigel Thornberry
 * Jodi Carlisle as Marianne Thornberry

Guest Stars

 * James Earl Jones as Z: The main antagonist of the special. He is an genetically engineered gray alien that escaped from a Government Facility near Sydney, Australia. He questions the meaning of his life due to the circumstances of his birth and strikes back against humanity to prove his own worth. Possessing great psychic power, he is able to manipulate the weather, control the minds of others and verbally communicate telepathically.
 * Kevin Michael Richardson as Koba: A powerful yet very overconfident genetically engineered reptilian humanoid-like Alien (resembling a bodybuilder) known as a Squamatian. He was rescued by Z along with the other genetically engineered aliens and in return he greatfully serves as Z's warrior. He is also shown to be a very skilled sword fighter.
 * Wendee Lee as Vitani: A ruthless and dangerous genetically engineered bipedal Bee-like alien known as a Hexanthon. She was rescued by Z along with other genetically engineered aliens and in return she greatfully serves as Z's warrior. She frequently fights alongside Koba.
 * Jim Ward as Stein: A shy genetically engineered tapir-like alien known as a Trunkinaspian. He was rescued by Alien Z along with other genetically engineered aliens and in return he greatfully serves as Z's scientist.
 * Travis Willingham as Babu: A dim-witted genetically engineered baboon like alien. He was rescued by Alien Z along with other genetically engineered aliens and in return he greatfully serves as Z's sidekick. He is also Zinder's sidekick.
 * Jeff Bennett as Zinder: An intelligent genetically engineered fox like alien called a Vulpian. He was rescued by Alien Z along with other genetically engineered aliens and in return he greatfully serves as Z's sidekick. He is more intelligent of a dim-witted duo consisting him and Babu.
 * Jeff Bennett as Jack Smith: A debonair and charismatic tourist guide and an old friend of Marianne Thornberry who is secretly an Australian CIA Agent who is working undercover. He scretly knows about Eliza's power to talk to Animals, and gets create an Army of Animals
 * Jim Cummings as Ted: A koala who helps Eliza deal with the aliens by powering the Bio-Battler K0ALA.
 * Jim Cummings as Fang: A saltwater crocodile who helps Eliza deal with the aliens by powering the Bio-Battler CR0C.
 * Adam Garcia as Roger: A red kangaroo that is going through a mid-life crisis after his only son Giam got eaten by Zander's pack, and has a great hatred for him. He helps Eliza deal with the aliens by powring the Bio-Battler R00.
 * Isla Fisher as Nya: A wedge tailed eagle who is feircly protective of her young. She helps Eliza deal with the aliens by powering the Bio Battler F1Y
 * Denis Leary as Zander: A dingo who's pack ate Roger's son Giam. He is unaware of Roger's hatred for him and thinks he is delurious. He helps Eliza deal with the aliensby powering the Bio Battler D1NG0
 * John DiMaggio, Kevin Michael Richardson, and Keith Ferguson as Harold, Frank, and Pete: A trio of razorbacks who help Eliza deal with the aliens by powering the Bio-Battler B0ARs
 * Hugh Jackman as Horner: A water buffalo who helps Eliza deal with the aliens by powering the Bio-Battler BUFALL0. Horner has seen the effects of other invasive species like him and thus battles the aliens with as much power as he can force.
 * Steve Carell as Slasher: An emu who helps Eliza deal with the aliens by powering the Bio-Battler F0WL. He is also Horner's best friend.

Animals Featured in this Episode

 * Aliens
 * Koala
 * Saltwater Crocodile
 * Red Kangaroo
 * Wedge Tailed Eagle
 * Dingo
 * Razorback
 * Australian Water Buffalo
 * Emu

Trivia

 * Z has similarities to Mewtwo from Pokemon: The First Movie. Both are genetically engineered, they question the meaning of their lives due to the circumstances of their birth, both attempted to strike back against humanity to prove their own worth, both created an army of clones, and both change their ways at the end and erase everyone's memory.