It is shown in "Kitty's Surprise Party" that Derek shares the same birthday as Ranger Kitty (who, as his mother mentions, is his favorite Danger Ranger).
Derek is voiced by Justin Cowden in both appearances.
- Fires and Liars (first appearance)
- Kitty's Surprise Party
- Fallbot Forget Me Not (song segment from "Fires and Liars" reused)
Big Reindeer on Campus
The Traveling Brayskis
Snow Way Out
Mission Rangers 2: The Royal Heist