Nexus Zero

Nexus Zero is a location associated with the Vok, presumably their home. It doesn't seem to be a planet, but rather a nebula where the Vok float around, talk, and keep their kidnapped victims in stasis.

There are other nexi, all part of a wormhole network facilitating travel across the galaxy. The only other specific one known is Nexus Earth, but that pathway was destroyed by the Metal Hunter's explosion. Because of this, Tigerhawk would be sent to Earth via a comet-like vessel instead.

Beast Wars cartoon
After interrogating Optimus Primal on Earth, the Vok decided to sterilize the planet, activating the Planet Buster. When the Planet Buster was operational, they declared, "Termination sequence engaged. Return to Nexus Zero," at which point they vanished from the Earth in a streak of light.

Tigatron and Airazor were later captured by a giant plant and "beamed" off the planet in a similar fashion. They ended up at Nexus Zero, where the Vok held them in some kind of stasis. Some time afterwards, a debate emerged among the Vok: Some were concerned about "a serious disruption in the timeflow, location: Nexus Earth." Others were skeptical, as "that nexus has been closed; the experiment has been terminated." In the end, they decided to merge Tigatron and Airazor into Tigerhawk and send him to Earth as their emissary to capture or destroy Megatron, who had caused the timestorm.

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Nexus Zero was a robotic planet in Vok Territory and the point of communication between the Vok and the rest of the universe. The planet was visited by Swindle on his interstellar travels; from the Vok, he purchased a force field that later he used to shield himself from Slo-Mo's powers. He recommended that she pay Nexus Zero a visit some time.