Joel Suzuki, Volume Four

It was a bittersweet victory for Joel Suzuki and his fellow Wavemakers: The Six States under the Shroud were liberated, Spectraland was spared a possible invasion, and the Earth was kept safe for now. But it all came at a heavy cost.
There's no time to wallow in sorrow, however. After Joel gains some amazing new abilities-time travel among them-an unexpected attack occurs, placing Spectraland in jeopardy once more and fatally injuring the one person who can safely guide Joel to his potential destiny as the most powerful Wavemaker ever to live.
Now it appears that the only way to make things right is for Joel to travel back in time and prevent the attack long before it even happens. But doing so might mean that he never discovers Spectraland in the first place! Will Joel be able to change the past, preserve the present, and save the future…all at once?