IMDb
5.0 /10
3k votes


Science Fiction · 1969 · 1h 5min
A group of Canadian university students agree to partake in a grisly psychological experiment, which renders them incapable of speech but able to communicate telepathically.
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IMDb
5.0 /10
3k votes
Rotten Tomatoes
The tomato isn't ripe
42 /100
—
TMDB
5.5 /10
91 votes
Letterboxd
5.4 /10
—
Weighted average
5.0/10
Available in United States (data from JustWatch via TMDB · click → opens in provider)