Yes, kids, Christopher Knight (The Brady Bunch Variety Hour) guest-starred on the Bigfoot & Wildboy segment of Krofft Supershow, which was likely in exchange for Kaptain Kool & the Kongs visiting the Bradys' Sunday night soiree. Christopher played a young man seemingly afflicted with lycantropy. Stress seemingly.
Edit, 10/12/17: Know It All Joe gives up the complete episode:
Series creators Joe Ruby & Ken Spears also were responsible for the segment Bigfoot replaced, Electra Woman & Dyna Girl, so they were working for the Kroffts AND Hanna-Barbera for those two seasons (1976-8) before launching their own studio. Ya wonder, though, if they were able to reclaim the rights from the Kroffts, and if they did, could Bigfoot & Wildboy make a comeback?
No rating. I have no memory of seeing this episode.