Crisis Point by Andy Briggs
The Hero Foundation is a shadow of its former self and Lord Eon - the most terrible supervillain ever - is still at large. Worse, he has hatched a plan to tear apart time. Toby and his superhero friends should be able to stop him ...but Pete has woken from his coma a different person and Lorna has disappeared. In the titanic struggle that will follow, friendships will be tested and superhero powers strained to the limit as time runs out for the world ...literally ...