- If Wingus has no heart and just uses Joe's instead, how did he survive when Joe was just a leg?
- Maybe he doesn't "need" a heart, per se? Or perhaps his heart was eventually transplanted into Joe?
- Seriously, what is Peri's true purpose?
- Well, he was considered by The Doctor to be a failed experiment, so maybe, his purpose was to be the prototype for some other mutant? Alternatively, he never had a purpose in the first place (or at least one The Doctor could think of) and that's why The Doctor deemed him a failure.
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