Plasma dynamic thruster

Careful, you don't where it's been or will be.

A plasma dynamic thruster is a key component of the larger space bridge technology. It opens the rift in space which allows space bridges to function. However left on its own, it isn't a particularly directed component, requiring stabilizers to prevent it from engaging repeatedly, warping itself and anything adjacent to it randomly throughout space.

Fiction

Animated cartoon

Bumblebee and Bulkhead were assigned the duty of salvaging the parts of the ruined Decepticon space bridge. Bumblebee stumbled upon the plasma dynamic thruster of the unit and was accidentally sent on a haphazard space journey, warping through several regions of the galaxy. This led to him getting eaten by a rock monster (and bringing it with him to Earth when his teammates attempted to locate him) before Bulkhead ultimately deactivated it through the use of Sari Sumdac's AllSpark Key.

This same thruster was later used to sabotage the transwarp drive of the Autobot Omega Supreme, who was at the time dominated by the mind of the bodiless Starscream. TransWarped

Bulkhead and Isaac Sumdac managed to build a second plasma dynamic thruster for their own space bridge. As part of a ploy to keep the professor safe from the newly sentient Dirt Boss, Bulkhead pretended to order the professor to finish building the plasma dynamic thruster immediately, but Isaac didn't understand the ruse and actually did build it. This proved advantageous when the Autobots needed to remove a tanker that was about to explode from the Fossil Fuel oil refinery, as Bulkhead configured the plasma dynamic thruster to teleport the tanker into Lake Erie. Three's a Crowd

The plasma dynamic thruster planted on Omega Supreme was discovered and neutralized, allowing the Decepticons on board to control the ship's propulsion. This Is Why I Hate Machines