Grandpa in My Pocket is a comedy drama series broadcast by CBeebies in 2009.
Synopsis
Grandpa Mason owns a magical Shrinking Cap that only his 10-year old grandson Jason knows about. The cap magically shrinks him to about 4 or 5 inches tall, giving him abilities such as running at high speed and bringing things to life. He has many adventures along the way, which are narrated by Jason.