Animorphs. Megamorphs

The Animorphs needed a break from the superhero stuff and everything should have been cool. But Rachel is missing and something is after the kids.

Visser Four has found the Time Matrix, the machine Elfangor had hidden, and he plans to use it to become Visser One.

Jake, the leader of the Animorphs, is given the chance to reverse his decision to start the group, but once he accepts the offer, strange things begin to happen and the team is forced to confront the new reality.

Tobias and his friends, a group of young people who have given the power to morph into animals in order to aid the alien Andalites in their battle against the evil Yeerks, face a life-and-death situation when Visser Four, a leader in the Yeerk invasion, finds a time machine.

Visser Three has unleashed a new and powerful threat to the Animorphs, one that will destroy them while they are morphing.

An explosion from a downed submarine blows the Animorphs millions of years back in time.