Justice League Unlimited Season 1 Episode 1 Initiation Episode Title:Initiation.Episode Description:The League expands their operations, enlisting new recruits across the globe. The newest of these is Green Arrow, who has repeatedly refused to respond to invitations to join the League. He is therefore pulled to the rebuilt, and much larger, Watchtower by teleport. Opting against joining, he hitches a ride back to Earth with the team of Green Lantern, Captain Atom and Supergirl, who have been sent on a mission to stop a giant, uncontrolled, nuclear-power machine in an unnamed Asian country. Supergirl learns about the value of having a solid mission plan, while Green Arrow is given the opportunity to see how his brand of heroism can be of use to the Justice League. This episode also features cameos from over 30 other heroes, many of whom would be featured in subsequent episodes. Most notably, Green Arrow's decision to join the League is shown to be influenced by catching his first glimpse of Black Canary.