Keller goes undercover at a mental hospital to uncover the truth about a string of mysterious deaths.
| Creator | Edward Hume |
|---|---|
| Actor | Karl Malden, Michael Douglas, Richard Hatch |
| Country | United States of America |
| Production | Quinn Martin Productions (QM) |
| Season 0(3 episode) |
|---|
| Season 1(26 episode) |
| Season 2(23 episode) |
| Season 3(23 episode) |
| Season 4(23 episode) |
| Season 5(24 episode) |
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