Jack Ryan is back, making his first foray into television as “Tom Clancy’s Jack Ryan,” with John Krasinski following Alec Baldwin, Harrison Ford, Ben Affleck and Chris Pine into the role of America’s action-packed CIA analyst.

Created from the nuts and bolts of the Clancy canon by Carlton Cuse (“Lost”) and Graham Roland (“Fringe”), the series is not the first time we have gone back to the beginning with Jack Ryan. When we meet him here, Ryan is merely a CIA analyst with a PhD in economics — ergo “Dr. Ryan.”