Prince William jokingly told employees at BAE Systems in Barrow-in-Furness, Cumbria that they can "get back to work" after watching him unveil a plaque at the factory.
The occasion was to mark the opening of a new suite of offices where the next generation of Britain's nuclear submarines will be designed.
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Rob Lowe said he was "devastated" by his close friend's death.
The company is relaunching the beloved classic alongside new lines.
Once named as Britain's tallest man, the 7'7" star played Mag The Mighty in the fantasy series. He died following heart failure.