aka Viking Women, aka Viking Women and the Sea Serpent, aka The Saga of the Viking Women, aka Undersea Monster
How bad is it? One of Roger Corman's no-budget one-week wonders.
Should you see it? Sure, though it's nothing special.
This film tends to be dull, so I expect the MST3K version of it might be the one to watch. A bunch of viking women get tired of waiting for their men to return from the sea, so they set out after them. They end up captured by the same tribe that captured their husbands, they escape and meet a very cheap back-projected lizard for a few minutes. Anyone with dark hair is suspect and Susan Cabot, the only name in the cast, fits the bill. The boats, costumes and weapons don't match either history or other films of the genre and the dialogue is intentionally stilted. There's a good shot of a horse in a narrow passage in Bronson Canyon (which goes to show how hard you have to look for anything interesting).