The Skeleton on Treadmill is rewarded for completing wave 35 on Bonus: Winter Wonderland on either Survival or Pure Strategy mode.

Similar to the Giraffe on Treadmill, Kobold on Treadmill and the Pet Rock, the Skeleton on Treadmill does not have any offensive or defensive stats. However, it provides a much larger increase to stats than most other Familiars. The Skeleton on Treadmill can have hero speed, where as Kobold on Treadmill  and the Pet Rock can't. It increases also increases hero speed by an additional 15%.

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