It's been two weeks since Traveling Matt's last postcard, so Gobo decides to go into Outer Space to look for him.

Mokey wins Ruler of the Rock Day, but she has a lot of trouble being in charge.

Boober's birthday is interrupted by a disaster (and didn't he just know this was going to happen?!).

Red is jealous of Gobo, until she discovers a sea monster in Fraggle Rock.

When Gobo finds Doc's radio, the messages that come from it threaten to destroy the unity of the Fraggles.

When Mokey brings a big furry caterpillar to the Rock to save her from the Gorgs, she has no idea what she's in for.

Gobo finds out about Uncle Matt's Secret Rules for Exploring through a postcard, and decides to open up a school for explorers. On his first expedition, he- along with Red, Wembley and Mokey- must travel to the Hole To Who-Knows-Where. Gobo becomes so fixated on the rules that he starts to disregard common sense, and of course, he and Red go at it again. Wembley and Mokey start to agree with Gobo's rules, but before long, they both side with Red. Gobo decides to go find the Hole To Who-Knows-Where by himself, not knowing that he is still tied on to Red. When Gobo and Red fall through the Hole, Gobo needs to use logic to get back home.

Boober worries that he bores his friends, leading to the return of his alter ego, Sidebottom. Doc, meanwhile, pretends to be an old sailor.

Boober believes his life is complete when he is given a rare and legendary gift. But he soon finds out gifts are meant to be shared.

Uncle Matt has gotten Gobo a frog from Outer Space for his birthday, but when it gets loose while Wembley is supposed to be hiding it, things get really crazy!

When Fraggle Rock's water supply is contaminated by the Silly Creatures, only Boober can save the day.