The Spider Robots
The spider robots were robots that X.A.N.A. either made or retrofitted within the Jungle Research Facility. They were X.A.N.A.'s only cybernetic monsters and were meant to be part of its Robot Army.
Timeline
They were first seen in Lab Rat, but they were only in their vivarium that time. Aelita hypothesized that the spider robots were originally regular spiders native to the region until X.A.N.A. began experimenting on them to turn them into assets for its plans. They later became a real threat in Bragging Rights, when X.A.N.A. uses an activated tower to control them to deal with intruders. Ulrich and Yumi had to fight them to destroy the generator.
They were shown to be able to jump very far, walk on walls and ceilings, and stab with their legs. The ones that hadn't been destroyed by Ulrich, Odd, and Yumi were incapacitated when the Jungle Research Facility's generators were destroyed, thus depowering the supercomputer and destroying the Forest Replika, ending X.A.N.A.'s control over them.
In Hard Luck, Yumi finds out that the electronic implants manufactured at the New Mexico Research Facility were being made for these (and possibly other similar experiments), as X.A.N.A. can control specifically made objects in the real world directly with activated towers.
Appearances
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