Mystery drama series. Bubs gets himself thrown into the greenhouse, and Billie and Amani trail the latest Shredder suspect.Source: CBBC
Series 4: 13. The Final Boss
Billie and Bubs rush to prom before the election results are announced... and the identity of the Shredder is finally revealed.
Series 4: 12. Crisis In Parallel Proms
Bubs says he's solved the mystery, but so does Blake. Who will Billie believe? And who will she end up at prom with?
Series 4: 11. Social Media 101
It's Bubs last day in the greenhouse - what did he find out? And Shak and Amani finally talk about prom!
Series 4: 10. Ordinary Heroes Assemble
Mystery drama series. Bubs gets himself thrown into the greenhouse, and Billie and Amani trail the latest Shredder suspect.
Series 4: 9. A Shake With Blake
Mystery drama series. The League of Ordinary Heroes rally round Selene - and get a new lead on the Shredder from the last person they thought would help.
Series 4: 8. Imperfect Harmony
Mystery drama series. Billie tries to coax a confession from her latest suspect and is asked an interesting question.
Series 4: 7. Sing When You're Winning
Mystery drama series. It's the final presidential head-to-head debate and Billie makes an unpopular decision.
Series 4: 6. The Alessandro Identity
Mystery drama series. The gang try to find out who hacked Alessandro's account, and Billie thinks she knows for sure who the Shredder is.
Series 4: 5. Milk Shakespeare
Mystery drama series. Echo needs persuading to stay in the presidential race, and Amani reveals a secret about Alessandro.
Series 4: 4. The Smell Of Freedom
Mystery drama series. Echo is nervous about the election head-to-head debate, but an anonymous tip helps Billie and Selene.
Series 4: 3. This Means War
Mystery drama series. Billie races to find someone who will run against Blake in the election, while Selene is angry about an online comment.
Series 4: 1. A Death-defying Mission
Mystery drama series. Billie is running for student president against Blake, but is accused of a crime she didn't commit!