Stillwater shows the kids his worm farm and other things he does to live green, which inspires them to come up with more ways to help Earth.

Stillwater is anxious about everything he has to do before his trip.

Karl and Koo think of ways to make their playdate last forever. 

Addy feels betrayed when her best friend spends time with someone else.

Karl is upset that MuMu, his favorite stuffed toy, is "broken." 

Karl copes with the loss of his favorite climbing tree.

Michael feels overwhelmed by how long it'll take to build his dream treehouse. 

Michael's day gets off to a rough start.

Addy forms a band with her friends and discovers playing together is harder than she expected. 

Addy's time with her classmates gets disrupted by Kar's antics.

Karl is disappointed his gem museum doesn't attract more visitors. 

Addy puts on a show with her brothers but need to learn to collaborate.

The arrival of Stillwater's niece Koo has Karl feeling a bit unseen.