Dr. Katherine "Kat" Manx is an ally character from Power Rangers SPD. She is an alien with cat-like features in charge of all research and design for Ranger technology at SPD's Earth Base. Aside from intelligence, Kat has shown to have a good deal of fighting potential and is able at holding her own in a fight. Despite her youthful appearance and looks, she is 147 human years old. This may be an inverse of how Earth cats age 7 years for every human one, which would put her at about 21 years old.
- Kat became an adopted mother of Snowdrop's Human Counterpart in Power Rangers Harmony Force.
- Kat permanently becomes the S.P.D. Kat Ranger after a new evil has risen for the S.P.D. Rangers.