AustLit

'On the verge of separating, the Nowhere Boys are drawn together for one last spell when Felix finds a magically sealed Book of Shadows. In performing the spell, the boys unwittingly release Tegan, a powerful teenage chaos force with a score to settle. Tegan’s appetite for revenge causes a string of catastrophic battles and as the link between their world and Negative Space grows more tenuous, the godlike child Bear, guardian of the multiverse, unleashes the full wrath of the Restoring Demon. The Nowhere Boys find themselves reluctantly drawn into an epic showdown where they discover that to save the lives of their loved ones and return stability to their world, they must make the ultimate sacrifice… themselves.' (Screen Australia)

'In the final series, the Nowhere Boys are back more powerful than ever and with an unlikely new member. But the new-year brings their most dangerous threat yet – an enemy capable of destroying the entire multiverse.'

Source: Program blurb.