The Authority: Relentless
Written by Warren Ellis
Art by Bryan Hitch and Paul Neary

The Circle (The Authority #1-4)

The Authority make their first public appearance to stop Kaizen Gamorra, an old enemy of Stormwatch, who wants to take advantage of Stormwatch's breakup to take revenge upon the world. To do this he uses engineered supersoldiers to destroy first Moscow and then part of London. The Authority manage to stop the attack on London, then predict the third and final attack in Los Angeles in time to avert it. Midnighter uses the Carrier to destroy the superhuman clone factory on Gamorra's island.

Shiftships (#5-8)

The Authority have to stop an invasion by a parallel Earth, specifically a parallel Britain called Sliding Albion. As it turns out, Jenny Sparks has met them before when their shiftships first appeared in 1920. Sliding Albion is a world where open contact between aliens (the blues) and humans during the 16th century led to interbreeding and an imperialist culture similar to the Victorian British Empire. After the Authority repel the initial wave of attacks, Jenny takes the Carrier to the Sliding Albion universe where she has the Doctor destroy Italy and what's left of the blues' regime along with it. In an all-frequencies message, she tells the people to take advantage of the second chance and "We are the Authority. Behave."