Brian, the Griffin family dog, has returned to "Family Guy" three weeks after he was killed off of the US animated series. The pooch was brought back Sunday night, thanks to a wrinkle in the time-space continuum, which allowed precocious toddler Stewie to steal his time machine from another version of himself, then push Brian out of the way of the car that killed him, TMZ said. "And thus endeth our warm, fuzzy holiday lesson: Never take those you love for granted, for they can be gone in a flash," show creator Seth MacFarlane tweeted after the episode aired.