Die-hard fans have probably spent the last few weeks grumbling over the lack of loyal Panthro on the 'ThunderCats' roster, but the old favorite made a triumphant return in the final minutes of last week's episode.

There wasn't time to answer many questions in the last installment, but tonight's episode, 'Old Friends,' will fill in plenty of gaps, utilizing flashbacks to great effect to give us a brief history of Panthro's journey.

If you haven't had a chance to watch yet, tonight is a great starting point, since you'll get all the backstory in one handy bite.

Join us after the jump for some highlights from tonight's episode. Light spoilers ahead!