Eric is the resident doctor on the USS Plan B, although is actually a vet. He seems to be a fan of Doctor Who, or just might be Dan writing him a quote from the 10th Doctor. Unfortunately, he is not a timelord, but a "drunk, chain-smoking vet who probably kills more [than] he's saved". It seems that Eric has tended to quite a few past and future Nathaniels, stating that there are 60 in the morgue, 28 on the planet below and 34 lost to time.
Eric is quite old, with a grey beard and hair, with very prominent eyebrows. He wears a vet's outfit (a green shirt and trousers) with a white coat worn over.