Katharine Hepburn's career took off in the 1940's, once she was put under contract with MGM studios.  Surprisingly, Hepburn is one of the few actors who doesn't speak badly about the supposedly 'tyrannical' Louis B. Mayer.  She liked him.  And she felt he respected her.  

After selling The Philadelphia Story to MGM, Hepburn was put under contract, and Mayer often gave her the scripts that she asked for.  Unlikely as it might have been, Louis B. Mayer seemed to understand her, and knew what vehicles she would work well in.  

Hepburn always admired Spencer Tracy and wanted him to play in The Philadelphia Story.  She didn't get him, but within a couple of years, she did find herself cast opposite him in the classic comedy, Woman of the Year.  The film was an instant hit, earning Hepburn her fourth Oscar nomination, and introducing the world to one of the most famous screen couples ever.  

Interestingly enough, it's rumored that Tracy didn't think as highly of her.  When it was suggested that he play opposite her in Woman of the Year, he questioned the decision, stating that he didn't think they had anything in common.  "How can I do a picture with a woman who has dirt under her fingernails and who is of ambiguous sexuality and always wears pants?"  It's not clear whether he actually said this, but the story ends with him seeing The Philadelphia Story and quickly changing his tune.

Tracy and Hepburn clicked well together.  Spencer was the gruff-acting 'man's man', while Hepburn was independent-thinking modern woman.  The friction on the screen was classic, and the intelligence of the two actors made their characters that much more interesting to watch.  In Adam's Rib, for example, the two played a bickering, but loving couple who are both lawyers.  They face each other head on in the court, when they take opposite sides in a divorce trial.   In Desk Set, he's a computer salesman, installing a computer system in a company, where she is the 'set in her ways' librarian.  

In real life, the pair struck up a life long romance that was controversial, yet typical Hepburn style.  Tracy was a devout Catholic, and despite a crumbling marriage, he refused to get a divorce.  Tracy and Hepburn carried on a love a affair behind the scenes, that wasn't talked about publicly.  While the world seemed to know that something was going on, the two refused to fall victim to tabloid sensationalism, and kept their relationship to themselves.  

Their love affair came to an end in 1967 with their ninth, and final screen pairing.  They were cast in Guess Who's Coming to Dinner, with Sydney Potier.  The film, about a white woman who brings her black fiancé home to her parents seems dated today, but at the time, it was a hot topic. Tracy and Hepburn, who seemed themselves to be forward thinking, were perfectly cast as Matt and Christina Drayton, the liberal minded parents who are forced to confront their own issues with racism.  

The film was a huge hit, and it earned several Oscar nominations, including Best Picture, Best Actor for Tracy and Best Actress for Hepburn.  It was well known at Oscar time that Spencer Tracy was in failing health. Because of this, it seemed inevitable that he would be honored with his third Oscar, and his first in almost thirty years. He didn't win, losing to Rod Steiger for In the Heat of the Night.  

Hepburn scowled at the fact that Tracy lost, despite the fact that she went on to win her second.  Guess Who's Coming to Dinner? actually set a new record for the Academy Awards, with the longest span of time between Oscar wins for an actor - 33 years.  Helen Hayes would later break the record, earning one for Airport in 1970, and widening the span with 37 years.

Meanwhile, some critics pointed out that Hepburn's win was a sentimental vote, with one reporter summing it up as win 'because her co-star died'.  Hepburn cabled a thank you to the Academy, stating that 'it's enormously gratifying to find someone else voted for me apart from myself'.

Tracy died in 1968, early one morning in his kitchen, where he was preparing a cup of tea.  Hepburn found him dead, (they were living together) and the first thing she did was call his wife.  

 

 More

  

Hepburn and Tracey together one last time.
Kate plays the liberal minded Christina Drayton. 
Kate is introduced to Sydney Potier, her daughters surprise date, and soon-to-be husband.
Spencer Tracy as Matt Drayton, can't seem to wrap his head around his daughters decision.
The two prepare for the arrival of Sydney's parents.
Katharine curses Spencer for objecting to the wedding of their daughter. 
Kate looks on as Spencer delivers an awe inspiring speech on the subject of their daughter.
This powerful scene, where Kate looks on as Spencer speaks about love, is perhaps the best example of their on-screen chemistry, and even makes sense of their unique love affair.
 

 

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"I have no idea how Spence felt about me. I can only say I think that if he hadn't liked me he wouldn't have hung around."

... discussing Spencer