He may be a cartoon character but if it were possible (and Im sure the universe would find a way), Id love to see Stewie in the TARDIS. Unfortunately, though, it seems unlikely that the Doctor would choose him as a companion to his travels. At first glance, Stewie seems to be an adorable one-year-old, but the Doctor wouldnt be fazed by this; after all, he speaks baby. Hed easily understand everything Stewie said, even if no one else could. From jokes too sickening for children to utter to plotting both world domination and his mothers murder, Stewies just too dark for a life with the Doctor. His devious and cool gadgets wouldnt help his cause, either. As much as the Doctor would be in awe that a baby could create time machines, teleports and universe manipulators, hed quickly put a stop to it! Stewie is definitely the kind of guy the Doctor is striving to save the universe from. As much as hed be a brilliantly hilarious addition to the TARDIS team, Stewies thoughts and gadgets are just far too evil for the life of a companion. Hes much more of an evil genius than a sweet, innocent assistant! What do you think? Know of any characters not mentioned that would be truly terrible in the TARDIS? Leave your opinions in the comment section below.