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Edge of Doom 

Nelson is told the Seaview could be destroyed while carrying a top secret defense weapon but he has to determine if Captain Crane is an impostor.


Justus Addiss


Irwin Allen (created by), William Welch




Episode cast overview:
Richard Basehart ... Adm. Harriman Nelson
David Hedison ... Capt. Lee B. Crane
Terry Becker ... Chief Francis Ethelbert Sharkey
Del Monroe Del Monroe ... Kowalski
Arch Whiting ... Sparks
Robert Dowdell ... Lt. Comdr. Chip Morton (as Bob Dowdell)


Nelson is told the Seaview could be destroyed while carrying a top secret defense weapon but he has to determine if Captain Crane is an impostor.

Plot Summary | Add Synopsis


Adventure | Sci-Fi





Release Date:

17 March 1968 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:

Mono (RCA Sound Recording)



Aspect Ratio:

1.33 : 1
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Did You Know?


Near the beginning, the saboteur dressed in a devil's mask knocks out the real Chief Sharkey. However his body shape is tall and thin unlike the actor impersonating Sharkey who is much shorter and a bit heavier as Sharkey is. See more »

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User Reviews

The Last Non-Science Fiction Episode Of Voyage/Sea
5 September 2010 | by StuOzSee all my reviews

Nelson is informed that the man who seems to be Captain Crane might actually be an imposter! It is up to the crew to find out if this is true.

Here is my problem with this episode: We are now at the closing stages of this 110 hour thing called Voyage/Sea. We have now seen everything/everyone under the sun appear on the show (aliens, monsters, time travellers, Blackbeard, Leprechauns, etc) so it is just too hard to be thrilled by this more mundane hour called The Edge Of Doom. The episode is obviously placed in this position to keep the adult viewers happy, the adult viewers who may not have even bothered watching the above mentioned childish way-out episodes, but if you follow Voyage every week you can't get too thrilled by The Edge Of Doom.

But having said all this, I am an Admiral Nelson fan as well as a Voyage fan, I love watching Nelson do almost anything on Voyage...a simple bothered reaction to the stuff that is going on around him is enough to hold my attention. The Edge Of Doom is okay.

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