[7] Space Squad: Gavan vs. Dekaranger (スペース・スクワッド ギャバンVSデカレンジャー, Supēsu Sukuwaddo Gyaban Tai Dekarenjā) is the first movie and was released on DVD and Blu-Ray on July 19, 2017.

[10][11][12] Joining the main cast are also Retsu Ichijouji (Space Sheriff Gavan) and Mad Gallant (Kyojuu Tokusou Juspion).

Geki interrupts the marriage of Jasmine's fellow Dekarangers Senichi "Sen-chan" Enari and Koume "Umeko" Kodou to ask for their help, seemingly under a request from the Galactic Union Police.

With Houji "Hoji" Tomasu, Sen and Umeko in tow, Geki takes Jasmine to the crime scene, where they discover the identity of the shooter, Kuronen, and track him down to Earth where they confront him alongside Mad Gallant and his aid Benikiba as well.

As the criminals escape once again, Gavan and the others return to the Dekarangers' base, where their investigation connects Mad Gallant and his cohorts with a mysterious case of hundreds of people drained of all of their blood, and the manufacturing company "Smile and Gentleness".

Geki and Umeko then question Lars, the president of Smile and Gentleness, who reveals that he is being threatened by Genmaku, with his secretary being one of their spies sent to keep an eye on him.

The Dekarangers investigate further and discover that all of the victims from the bloodsucking case had the ability to transform, and that Shelly had a higher power than the others; implying that she must be alive and being used by Lars to complete his plan.

Umeko recovers and reveals that she was not left behind by Gavan, as she asked to deal with Benikiba by herself, but was unaware of Lars' true colors and was stabbed by him.

As Lars beats Shelly in order to have her bleed enough to complete his weapon, "Satan Goth", Benikiba states that her mission assisting him is over and leaves.

Geki is nominated as the first leader of the "Space Squad", instructing him to select other Sentai and Metal Heroes to form a team to take down Genmaku once and for all.