Tron

Tron (1982). Jeff Bridges is sucked inside a computer, where he discovers that all the programs look like the people who wrote them. The evil boss has a master control program that is doing all kinds of evil stuff. The only one who can stop it is the Tron program, programmed and played by Bruce Boxleitner. To do this they have to fight there way through a variety of computer games.

It's a Disney film and, if not entirely for kids, certainly kid-oriented and is rated "not Gruesome" by the V__ movie preview board. It looks fantastic - some of the objects look dated, but they look like a CGI company today made some retro-looking space invaders. The plot makes no damn sense at all. Bridges and the Cindy Morgan's program seem to have a romantic subplot, but it doesn't go anywhere, and when he comes out of the computer, she seems to be equally good friends with Boxleitner and Bridges. We enjoyed it immensely. Here's the iconic Lightcycle scene.

It's a must-see if only because it is constantly referenced in computer-nerd circles.