The new leader of a terrorist race of aliens called Stellairians wants to embark on a new era of peace and comes to Earth for negotiations ... bringing along his spoiled teenage daughter. The Stellairians age rapidly in Earth's atmosphere - about 100 years in a day - so Kima is reminded to take her hypo-spray, located on a chain around her neck. Kay and Jay are assigned baby-sitting duty, and take Kima to the mall - where a group of Frostifarian Kidnappers (who had their icy planet scorched by Skon) create a diversion and nab Kima. During the chase, her hypo-spray comes loose and accidentally exposes Kay to the anti-aging serum. As a result, he begins to regress at a rapid rate - going from adult Kay, to a 12-year-old, to a three-year-old Toddler, and finally to a Baby. In his infant form, Kay...along with Jay... must find Kima before she becomes too old and dies, and before her father Skon blows up the planet, as he threatens if his daughter is not returned safely.