Kelsie arrives on the Builder homeworld for the final showdown.

What if...?

Kelsie and Paige visit a world that was destroyed by the Builders in search of a powerful weapon.

After being captured by the Shakers, Kelsie and Paige are thrust into a new way of life.

Kelsie reflects on her past before she's thrust into an uncertain future.

Kelsie and Isaac play a virtual-reality video game. An interloper ruins the fun.

Kelsie, Paige and Zandria board a mysterious spaceship and make a startling discovery.

Kelsie butts heads with Paige and Zandria at an alien's neighborhood cookout.

Paige tells her side of the story.

Season Premiere! Kelsie reunites with Paige in outer space, but her old friend isn't the same.

Season Finale! Kelsie and Isaac battle the Cocoon Man, and the ultimate threat reveals itself.

Kelsie reteams with Isaac West to travel into the unknown.

Kelsie's friend Gwen gets caught up in all this sci-fi nonsense again.

As the Cocoon Man rampages through town, Kelsie prepares to strike back.

Kelsie investigates a mysterious vessel in Alaska, hoping to find answers about her missing friend Paige.

Kelsie tracks down an alien in California and meets a local vigilante who might be her equal.

Kelsie poses as a teacher and has to deduce which one of her students is an evil alien.

Kelsie goes undercover as a cheerleader to track down an alien enemy.

Season Premiere! Whatever happened to Kelsie James?

Season Finale! Kelsie and Paige seek help from the smartest person in Chicago.

An old enemy returns to give Kelsie information that will forever change her life.

Kelsie goes to the movies with a boy. Everything goes very wrong.

When Principal Whitaker enacts his master plan, Kelsie tries to stop it... but only makes things worse.

Kelsie protects an unexpected ally from a relentless pursuer.

When Gwen starts acting weird again, Kelsie thinks she can handle the situation on her own. As it turns out, she needs Paige more than ever.