|Voice actor(s)||Ken Boynton|
|Game(s)||Pajama Sam in "No Need To Hide When It's Dark Outside"|
Grandfather Clock is a large clock in Pajama Sam in "No Need To Hide When It's Dark Outside" with gears, cogs and a pendulum in a corridor/landing area through the Doors of Knowledge.
The Grandfather Clock appears only in the Hidden Mines storyline.
In the Hidden Mines storyline, Sam will need one of Grandfather Clock's gears in order to repair the crank in the mines. Grandfather Clock will allow this if Sam can help set the time on his face to the correct time. To do this, Sam must have already checked the digital clock in Darkness's Living Room. Once Sam sets Grandfather Clock's time to the correct time, he is free to choose a gear.
According to Grandfather Clock, Sam wasn't the first person to arrive to defeat Darkness as he's seen it before.