Question: Why was this series cancelled after three seasons?

Spider-Man (1967)
Episode list - season 1
Starring: Paul Soles, Paul Kligman, Bernard Cowan, Peg Dixon

Starring: Paul Soles, Paul Kligman, Bernard Cowan, Peg Dixon
Question: Why was this series cancelled after three seasons?
Answer: After doing some research, it appears that after the first production went bankrupt, the second and third seasons were produced at a dramatically reduced budget, which most likely impacted the decision.
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