A pre-Pixar created the first ever fully CGI-sequence
The first Star Trek film was an Academy Award nominee, a film that raised the bar for its creativity and use of technology. Yet, it was The Wrath of Khan that truly pushed the medium forward. In the 1970's, there was a group that was called the Graphics Group and they worked on the Star Trek film. Due to their involvement, The Wrath of Khan featured the first ever fully computer-generated image.
It was a revolutionary idea at the time and added some much-needed pizazz to a scene that needed it. The scene in question is Carol Marcu's explanation of what the Genesis device is and how it works, using a simulated planet in her demonstration. The planet's complete makeover and the effects that go alongside it were all created by the Graphics Group, then owned by Lucasfilm.
They would also be responsible for making the fantastically well-done Stain Glass Knight sequence in Young Sherlock. Not long after that film came out, however, they were sold off to Apple visionary Steve Jobs and were renamed Pixar.
They would of course go on to make the Toy Story films, as well as many others, before eventually being bought by Disney. The purchase from Disney reunited Pixar with LucasArts, who were also bought by Disney.