This was a weekly year-long event, similar to “52” and “Countdown” but unlike the latter, it was an entirely self-contained story. Unlike either of its predecessors, however, it focused on the major super-heroes of the DC Universe, Superman, Batman, and Wonder Woman, instead of the lesser developed characters.
Each issue of Trinity had two stories; the main one, focusing on the Trinity themselves, and the backup, focusing on other characters involved in the overall storyline.
A narrator explains that space is not empty and silent as usually it’s usually believed to be if one has the ability to see and hear what is there. A voice, appearing to come from a face made of space screams “LET ME OUT!!”
In Keystone City, Bruce Wayne has rented out the entire end section of the trendy Keystone Coffee Pier and is sitting by himself. He’s soon joined by Clark Kent, and as the two are ordering, Diana Prince. The trio settle in and have a conversation about the difference between Batman and Superman’s “Secret Identities” and Wonder Woman’s “Private Identity”. She insists her private identity is just a muted version of her hero self, just not broadcasting it, while Batman and Superman transform themselves into wholly new people, which she thinks they enjoy. Superman admits to joining it “a little”, but before the conversation can get much further Batman attempts to get them on to the topic they came to discuss, their dreams.
Superman’s dream takes place in space. In space he saw an enraged “cosmic extraterrestrial intelligence” warping the fabric of space-time. Wonder Woman saw an “Ancient angry God” chained down, similar to Prometheus chained to the rock, straining to free itself. Batman’s dream took place in shadows, but in them was an imprisoned criminal attempting to escape. Wonder Woman says they’re all the same dream, but before they can discuss it further Superman hears a report from a radio in the kitchen that a metahuman–described as one of Batman’s–is robbing the Hibbard Museum. The three heroes get up, planning to leap to action, but are stopped when Superman further hears that “it’s being taken care of.”
Downtown, the Flash and his children, Iris and Jai West, recover a chalice from Clayface, then capture him by breaking him into multiple pieces and putting them into separate bags. Watching, Batman notes that the Flash is the very reason he decided to meet in Keystone City, since when he tried to call him his wife Linda said he was “out” with the kids.
In his street cloths, the Flash meets the other heroes at the Pier where they ask about his dreams, which haven’t been unusual. When he asks if a dream is even important, Wonder Woman tells him he would feel different if he had it, calling the shared dream oracular, while Superman, unwilling to go that far, says it was surely some kind of “Mental Contact” and the being in the dream is real.
The heroes decide to separate but remind each other to “stay alert, stay aware, and stay in touch.”
On his flight home, Superman hears a voice say “out”.
Batman, thinking to himself that he didn’t really need to meet with the other two but wanted to look into their eyes, hears a voice as well, before the Batplane begins to fill with smoke and leaves.
Wonder Woman, knowing the group is doing the right thing, also hearing the voice. As she does, energy blasts strike around her, to which she turns around challenging whatever it is to “get started.”
The voice in Superman’s head gets louder and louder, then suddenly stops. In its place is the sound of broken glass and people screaming as a large pink orb crashes through a building in front of him.