Spider-Man - Season 2 - Eps 10: Vine
A giant plant escapes from storage in a house belonging to Prof. Smithers, a missing scientist. Spidey goes through a portal (located in the scientist's home) to prehistoric times to find some defense against the plant and meets Smithers, who tells to him that two radium gems in an idol in a nearby city, if ingested by the plant in New York, will disintegrate it.
About Spider-Man

Title: Spider-Man
First Air Date: 1967-09-09
Last Air Date: 1970-06-14
Status: Ended
Rating: 7.691/10 (from 194 votes)
Language: EN
Seasons: 3
Total Episodes: 77
Network: ABC Syndication
Genres: Kids, Animation, Action & Adventure
Production Companies: Grantray-Lawrence Animation, Krantz Animation
Synopsis
The bite of a radioactive spider transforms a teen into a superhero.
Cast

Bernard Cowan
Narrator (voice)

Paul Soles
Peter Park / Spider-Man (voice)

Paul Kligman
J. Jonah Jameson (voice)

Peg Dixon
Mary Jane Watson / May Parker / Betty Brant (voice)

Billie Mae Richards
Paperboy (voice) (uncredited)

Corinne Conley

Larry D. Mann

Len Carlson
Green Goblin (voice) (uncredited)