Doug Thompson changed dramatically from Byrne's interpretation to Mantlo's interpretation: caring and level-headed to ranting, raving shotgun-carrying lunatic.
Richard Easton mated with Nelvanna, and went nuts, though the headband might have had something to do with that, too. IMO, something similar happened to Thompson when he mated with Snowbird.
Does this sound plausible? Does anybody have a different theory as to Thompson's change?