Tatsuya and Naoto knew each other from college.
Asami (Tatsuya's Dad) mentions how the Londarz had been attacking their city/town for the past 6 months.
Tatsuya explains how he and Naoto were in the same karate class and that they were the 2 best students however 1 day Naoto just quits the karate class.
Here's Univolt

Here's a shot of the Red Time Force Ranger but with his visor destroyed
Here's the Q-Rex
Here's the Time Force Megazord Mode Red and the Time Shadow Megazord
Here's another shot of the Q-Rex