"Sammy Shrink" was a strip that originated in Wham!. It later made its way through a succession of other comics: Smash!, Pow!, Knockout and finally Whizzer and Chips. The strip was originally drawn by Dave Jenner and later by Terry Bave.
Sammy was a tiny boy who got into all manner of scrapes in a Brobdingnagian suburbia. Despite his name, Sammy could not actually shrink, at least not in early strips: he was simply very small. Later strips made use of the idea that Sammy could shrink at will.