Mickey and Goofy venture into the dangerous Scorpion Valley in search of two explorers who possess a fragment of the Zodiac Stone. On the way, they learn that another party is on the same mission.; Gyro invents a portable door which can instantly become a portal through any wall. The Beagle Boys steal it to gain access to Scrooge's money bin.; Minnie gets mad at Mickey for calling unwanted attention to them, not realizing that she's the real cause.; Donald goes donkey-riding, but only after he's properly attired.