Kirkus
Can’t solve your problem in the present? Try time travel, superhero-style!

Fresh from his disastrous collaboration with the insane villain Mad Mask (2012), 12-year-old Kyle Camden, aka Azure Avenger (in his mind) and aka Blue Freak (in the minds of everyone else in Bouring, N.Y.), concocts a new scheme to expose vacuous, probable-alien Mighty Mike as less than the good guy he pretends to be. Kyle uses his superintelligence (obtained from an encounter with space plasma) to create a time machine so he can videotape Mike emerging from the plasma, thus proving to the world he’s not human. Things go wrong in the present (zombies!) and the past (Kyle ends up in 1987 instead of a couple months ago). His chronovessel fried, Kyle tries to make the best of the situation, but who knew there was no Internet in 1987?! He finds that some allies can’t be trusted and some enemies are more than they appear…and learns a few things about his dad and his grandfather, all on the way to saving the world…AGAIN! Lyga’s third fun and furious Archvillain tale is somewhat slower and brainier than the others, but it solves many mysteries and opens up a few more. Characters grow, the technobabble is funny, and the time travel is nicely thought through.

It stands alone well enough, but it will be best enjoyed by established series fans.

The Trades
Yesterday Again is one of the best time-travel stories out there. I once sat on a convention panel with author Eric Flint discussing time travel, and I was reminded of Flint’s comment that it’s hard to write a good time travel story because in the end none of the changes can ever matter. That hasn’t stopped Flint from writing some interesting time travel novels, and it was certainly no impediment to Lyga, who just proved himself more than a master. — Read the Complete Review

SciFiPulse.Net
Okay. We have a superhero, an archvillain, an alien, time travel, and an enigma named Walter Lundergaard. Where was this book when I was 10? — Read the Complete Review

Booklist (February 15, 2013)
Rounding off his Archvillain trilogy, Lyga sends frustrated preteen antihero Kyle (self-styled Azure Avenger, but more commonly dubbed Blue Freak) back in time to find definitive evidence that rival superhero Mighty Mike is really an alien invader. Landing in 1987 (an occasion for hilarity: “What on earth is an ‘Internet’?”), he discovers a new nemesis, plus keys to his own past and future, before returning to save his hometown once again—this time from a (wait for it) zombie plague. Though the plot is a messy tangle, Kyle’s relationships with his best friend and with Mighty Mike are at last straightened out.