hd.thomson-multimediaReturn to the Planet of the Apes Invasion of the Underdwellers (1975–1976) watch online HD
- Original title:Invasion of the Underdwellers
- Category:TV Episode / Animation / Adventure / Sci-Fi
- Released:1975–1976
- Director:Doug Wildey
- Actors:Austin Stoker,Philippa Harris,Henry Corden
- Writer:John Strong,David H. DePatie
- Duration:24min
- Video type:TV Episode
- Rating 6.8
- Votes 517
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Short summary
General Urko hatches a scheme to declare war on the Underdwellers. Bill, Jeff, and Judy must find a way to stop him.
| Episode cast overview: | |||
 | Austin Stoker | - | Jeff Allen (voice) |
 | Philippa Harris | - | Dr. Zira (voice) |
 | Henry Corden | - | General Urko (voice) |
| Richard Blackburn | - | Dr. Zaius (voice) |
| Edwin Mills | - | Dr. Cornelius (voice) |
 | Claudette Nevins | - | Judy Franklin / Nova (voice) |
| Tom Williams | - | Bill Hudson (voice) |