A Classic in Super-hero movies.
This is what made me fall for Kara Zor-El. No other Supergirl can compare. I think to this day I read Silver Age Kara in Helen Slater's voice. The plot isn't as complicated as some make it out to be. Kara lives in Argo city which is in another dimension and stays alive due to a device called the Omegahedron, a sphere with immense power. After Kara loses the device she takes a perilous trip to Earth to find it using a bracelet that glows in its presence.
There is a lot of good in this movie. Helen Slater brings Kara to life like no one else. She shows a niavity that comes from living in an idealistic commune that Argo is shown to be. Don't mistake this for stupidity.As for the supporting cast, Maureen Teefy and Peter O'Toole stand out as giving fine performances. The plot in its basic form is sound but suffered from various edits over the years.
There is a lot of bad in this movie. Faye Dunaway camps it up as Selena but manages to still be sinister. Selena is not a bad character but the dialogue fails the actors.The biggest example of this is in Ethan. He goes from a typical 80's beefcake character to a straightlaced poet after a love potion which is baffling. I also wonder why the writers thought Ethan was Supergirl's perfect love interest rather than eyecandy for female viewers. There is nothing about him that resembles Supergirl's pre crisis love interests. I find the biggest letdown to be the coincidences. It detracts from the realism of the movie that Supergirl mentions she is Superman's cousin 5 times and that she meets her attackers in 'Lover's Lane' and put in a room with Lucy Lane.
This is an entertaining movie, its reliance on fashions may date it but I found it entertaining especially as a child.