The connection between the images is:
As the four images represent:
Top-left: "Scotty" the T. Rex, an exhibit at the T.rex Discovery Centre in Saskatchewan, Canada.
Top-right: Scotty Moore, Elvis Presley's first guitarist.
Bottom-right: The character Montgomery "Scotty" Scott from Star Trek.
Bottom-left: A Scottish Terrier, affectionately shortened to 'Scottie'.