Buck is sent to the gambling city Sinaloa with Directorate special agent Marla Landers to rescue a young woman who has been kidnapped by the city's ruler, Velosi. Velosi plans to extract some information from the woman's mind in order to destroy one of his competitors. The information involves plans for the Draconian Hatchet fighters, which have been plaguing Earth's defense forces.

Murder and romance await Buck, Wilma, Theo and Twiki aboard the cruise ship Lyran Queen. Buck befriends a shy young girl (Beck) while investigating the attempted kidnapping of beauty queen Miss Cosmos (Stratten) by a woman (Noble) with superpowers. To his surprise, Buck learns the true identity of the mystery woman as he seeks the location of Miss Cosmos before a deadly dissection laser kills her.

It's Buck Roger's 534th birthday, and Wilma and Dr. Huer plan a surprise party to cheer up the homesick astronaut. Wilma arranges to get Buck "out of the way" by having him accompany Dr. Huer's assistant to New Detroit with the doctor's business schedule. Meanwhile, a man who is plotting revenge against Huer attempts to gain access to the schedule from the assistant so that he can ambush and kill Dr. Huer.

Twiki is kidnapped by the evil ruler of a mining colony who, faced with an uprising of the mine workers, plans to make duplicates of the mechanoid to work the mines. While in the mines attempting to rescue Twiki, Buck discovers something that will help Earth destroy a 10-ton ice asteroid that is on a collision course with Earth.