Jim From Accounting said:
duck hunt and time crisis
You, sir, just won the thread.
I'll try and go one better though... the light-phaser version of "Operation: Wolf", and either "Barney's Hide and Seek" or "Barbie: Island Princess".
On a more serious note... if you combined the graphics, characters, control system and intelligent enemy AI of "Half Life 2" with the RPG balance of "Deus Ex", the story and antagonist of "System Shock", and the RPG elements, sound design and pure atmosphere of "System Shock 2", you would probably have the best game ever made.