Atlantis survivor Mark Harris breathes underwater, withstands extreme depth pressures and wields superhuman strength.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Melt Down | 1977-09-22 | 60 min |
| Season 1 | Episode 2 | The Mudworm | 1977-10-13 | 60 min |
| Season 1 | Episode 3 | Hawk of Mu | 1977-10-18 | 60 min |
| Season 1 | Episode 4 | Giant | 1977-10-25 | 60 min |
| Season 1 | Episode 5 | Man O'War | 1977-11-01 | 60 min |
| Season 1 | Episode 6 | Shoot-Out at Land's End | 1977-11-08 | 60 min |
| Season 1 | Episode 7 | Crystal Water, Sudden Death | 1977-11-22 | 60 min |
| Season 1 | Episode 8 | The Naked Montague | 1977-12-06 | 60 min |
| Season 1 | Episode 9 | C.W. Hyde | 1977-12-13 | 60 min |
| Season 1 | Episode 10 | Scavenger Hunt | 1978-04-18 | 60 min |
| Season 1 | Episode 11 | Imp | 1978-04-25 | 60 min |
| Season 1 | Episode 12 | Siren | 1978-05-02 | 60 min |
| Season 1 | Episode 13 | Deadly Carnival | 1978-06-06 | 60 min |
| Production | Herbert F. Solow | Producer |
