In Crash 2: Cortex Strikes Back, Ripper Roo returns after going through university to become a psychologist. He is now called "'Doctor Roo'". When Crash goes to fight him, he is in a library reading, but attempts to turn normal spaces in TNT, which lead back to him, and the explosion once again stops Ripper Roo.
He also appeared in Crash Team Racing as the first boss and a secret racer. Defeating Ripper Roo earned the player a key. In Crash Bash, he would occasionally make appearances to throw TNT at the contestants.
Ripper Roo made a cameo in Crash Twinsanity at Crash's "Birthday Party" along with a collection of Crash's former foes, allied to defeat Crash.