Dyw Thom Creed ddim eisiau adio i boen ei dad, ac felly mae’n cadw cyfrinachau. Cyfrinachau fel ei bwerau, a’r ffaith ei bod wedi cael ei ofyn i ymuno a’r Gynghrair, yr union sefydliad wnaeth ddirmygu ei dad, neu’r ffaith ei fod yn hoyw – cyfrinach mae Thom prin yn gallu wynebu ei hun.

Pan mae Thom yn ymuno a’r Gynghrair, mae’n cwrdd â grŵp newydd o arwyr uchelgeisiol sydd hefyd yn cadw cyfrinachau. Pan maent yn dod o hyd i gynllwyn tu fewn i’r Gynghrair ei hun, bydd rhaid i’r arwyr ddysgu i ymddiried yn ei gilydd, a bydd rhaid i Thom ddygymod gorffenol ei dad, a ddarganfod pa fath o arwr mae ef eisiau bod.

The last thing in the world Thom Creed wants is to add to his father’s pain, so he keeps secrets. Like that he has special powers. And that he’s been asked to join the League – the very organization of superheroes that spurned his dad. But the most painful secret of all is one Thom can barely face himself: he’s gay.

But becoming a member of the League opens up a new world to Thom. There, he connects with a misfit group of aspiring heroes, including Scarlett, who can control fire but not her anger; Typhoid Larry, who can make anyone sick with his touch; and Ruth, a wise old broad who can see the future. Like Thom, these heroes have things to hide; but they will have to learn to trust one another when they uncover a deadly conspiracy within the League.

To survive, Thom will face challenges he never imagined. To find happiness, he’ll have to come to terms with his father’s past and discover the kind of hero he really wants to be.