The unlucky Robby begins a voyage to the planet Isekandar, but gains an unlikely travelling companion in the brilliant young Hatchi.

Robby and Hatchi make a pit stop on Mars, where they encounter an octopus.

Hatchi and Robby wonder why Hizakuriger is aboard their ship and wind up on Pluto; the pair receive a request to do for Pluto what they did for Mars.

On the ocean planet Odwarla, Hatchi and Robby encounter the indigenous merfolk.

Robby and Hatchi hit a road block when they find themselves in need of travel permits, so they take a detour to Haccone for a dip in the hot springs and think about what to do next.

Yang corners Robby and Hatchi on Hamama II during the planet's Great Eel Festival; the eels' powers have an effect on Yang.