Here's a fan site that tells the story about it:
Fly Jaime - Six Million Dollar Man and Bionic Woman
"Production of Season 1 of The Bionic Woman was commissioned with very short notice before broadcast. This resulted in a few time-saving and cost-cutting measures being implemented in order to have a half-season's worth of episodes ready in time to air during the first half of 1976. One of the measures was the decision to remake "Survival of the Fittest" which had been the second regular hour-long first-season episode of The Six Million Dollar Man and which was a little over two years old at this point."
Fly Jaime - Six Million Dollar Man and Bionic Woman
"Production of Season 1 of The Bionic Woman was commissioned with very short notice before broadcast. This resulted in a few time-saving and cost-cutting measures being implemented in order to have a half-season's worth of episodes ready in time to air during the first half of 1976. One of the measures was the decision to remake "Survival of the Fittest" which had been the second regular hour-long first-season episode of The Six Million Dollar Man and which was a little over two years old at this point."
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