Galactica Probe One is a Viper that Troy and Dillon are given by Xaviar, believing him to be Lieutenant Nash.
The Viper is thoroughly sabotaged by Xaviar, who, masquerading as Nash, convinces them of a mission that will allow them to capture him. Troy and Dillon are able to effect repairs by bypassing the computron circuits and return to Earth in time to thwart Xaviar's plan to use the Super Scouts as hostages (Spaceball).