- Mavis as Numbuh 5
- Shadow (from Sonic The Hedgehog) as Heinrich Von Marzipan (Chocolate Monster)
- Spencer as Heinrich Von Marzipan (Human)
- Thomas as Numbuh 1 (Cameo)
- Duck as Numbuh 2 (Cameo)
- Rosie as Numbuh 3 (Cameo)
- Percy as Numbuh 4 (Cameo)
- Lillie Lightship (from TUGS) as Jessica (Cameo) (Flashback)
- Isobella as Numbuh 83 (Cameo)
- Daisy as Cree Lincoln (Cameo)
- Arry as Toilenator (Cameo)
- Ben Diskin - Thomas and Duck
- Lauren Tom - Rosie
- Dee Bradley Baker - Percy, Shadow The Hedgehog and Spencer
- Cree Summer - Mavis and Daisy
- Mavis: I Haff Returned!, Huh?
- Duck: Hey Percy, This Chocolate is delicious!
- Percy: Hum, I don't know, I'm not really such a fan of something...
- Shadow: Vhere is she?!, Vhere is Mafis Ze Qvarry Diesel?!
- Thomas: What do you want?, with Mavis?
- Shadow: To repay her, uf ze kind favor for vhat she did to me, now you vill tell me!
- Mavis: Shadow!, Let him go!
- Shadow: Gladly, It is you I vant!
- Mavis: Shadow, What happened to you, You became a monster?
- Shadow: Oh, You noticed, Vell it's only your fault!
- Mavis: Spencer.
- Spencer: Mavis, Not content vith mere victory I see?, You haff come here to rubbing mein face, Haffn't you?
- Mavis: I just brought into a little bit of something, Give me a call when you're less bitter and a little more sweet, See around Spencer.
- Spencer: Huh!, mein, mein, huh!, Cheesebuger, huh, oh bless you, Mafis Ze Qvarry Diesel, Bless you. Ach so gut, Ach Ja, Huh?, Pickles!, Ach du liebe, Oh I hate ze pickles!