The objective of each game is to solve a series of puzzles to aid characters named Dr.
After Sierra was acquired by CUC International in 1996, the series would be continued by their Knowledge Adventure division who turned it into a more action-oriented game.
Brain (1992), are hybrid puzzle adventure games created by an in-house team at Sierra.
Brain and Quest for Glory series are designed by Corey Cole, though Dr. Cranium mentions once that one of his descendants would get "his very own game").
Brain, a twenty-something genius instead of an old mad scientist (though this may be explained by identifying the young man with Pro).