[jonnathanson]

The classic "a wizard did it" defense. :) Come to think of it, that's just about the only potential appearance of Q in Enterprise I would have tolerated. "Oh, they look different? Hmmm. Q did it."

[Pxtl]

My favored approach would be to just do it off-camera.

One episode right at the end, Klingons show up looking de-Klingon'd. "What the hell happened to the Klingons?" Klingons won't say.

Sometimes, the audience just doesn't get to know.