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This question here Star Trek TOS episode with obvious stunt double for William Shatner made me think of an episode of The Invaders that features a very obvious stuntman instead of Gene Hackman.

IIRC he was fighting Roy Thinnes outside yet another secret facility.

What was that episode?

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This would be The Spores, episode 7 of season 2 of The Invaders.

In this episode Gene Hackman plays an invader (Tom Jessup) who is transporting a briefcase containing something vital: spores. These organisms will grow into aliens able to withstand Earth's atmosphere. As Jessup desperately tries to find the briefcase, the spores inside of it continue to develop.

The fight that the OP remembers takes place towards the end of the episode outside a greenhouse.

Plot description is on Wikipedia

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