突突兔（Tweak）是小队的机械工程师，负责保养小队从灯笼鱼艇到魔鬼鱼艇的所有交通工具。她喜欢为某项特殊的任务改造机械，并且喜欢制作那些以意想不到的方式工作的新奇发明。她喜欢吃胡萝卜，为大家研究了很多发明，也带来了不少麻烦。她总是为她的新发明感到骄傲。“快到你来不及说完拔呀拔呀拔萝卜”是她的口头禅。
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| 性别 | 女 |
|---|---|
| 物种 | 沼泽兔 |
| 颜色 | 薄荷绿 |
| 职业 | 工程师 |
| 家人 | 沼泽游侠（父亲） |
| 初次露面 | 海底风暴 |
| 最近露面 | 大电影3：海啸大危机 |
| 配音演员 | 周湘宁 |
突突兔是小队的机械工程师，负责保养小队从灯笼鱼艇到魔鬼鱼艇的所有交通工具。她喜欢为某项特殊的任务改造机械，并且喜欢制作那些以意想不到的方式工作的新奇发明。她喜欢吃胡萝卜，为大家研究了很多发明，也带来了不少麻烦。她总是为她的新发明感到骄傲。“快到你来不及说完拔呀拔呀拔萝卜”（英文版是：“faster than you can say ‘buncha munchy crunchy carrots’!”）是她的口头禅。
Tweak is the engineer for the Octopod. It is her job to make sure that everything is running smoothly below deck in the engine room and to maintain all the Octonaut vehicles. She has even invented a number of new machines for the Octonauts, most notably the Gup submersibles. She is the daughter of Ranger Marsh and an unnamed mother.
She likes to build and fix things, but she doesn't like how Kwazii or Shellington crash the Gups (mostly the Gup-B and D) and is forced to fix them again and again as a result.
The many machines and devices Tweak invents sometimes work out in unexpected ways. She is one of the only three females on the Octonauts crew, with the other two being Dashi and Tominnow the Vegimal.
Unlike most of the other members of the crew that have rooms up in the pods, Tweak lives and sleeps where she works the most and that's down in the launch bay. She sleeps without pajamas and has her toolbelt and bandana on when sleeping in her bed.
She's not always down in the launch bay, though. One time, she was found up in the garden pod growing her favourite food: fresh carrots (as seen in The Baby Dolphin). She is best friends with Dashi and Sandy the Leatherback Sea Turtle.
In both the original UK version and US version of the show, Tweak has a Southern accent when she speaks. It appears to sound a lot stronger in the US version, though this is only the case for Season 1.