"Send in the Clones" is my biggest favourite solo episode for this show. It introduces Magica, a witch with russian accent, and one who gets frequently carried away when talking about Scrooge's no1. dime. This is the only episode where Magica was allied with the Beagle Boys as well.
"Send in the Clones" is one of (if not) the funniest episode of the show. The fast paced carnage is hilarious, and for once, Mrs. Beakley is a very sympathetic character, and has a strong role as well. As for the Beagles, I always thought Burger is the funniest one, with Bigtime being a close second. The one-shot character Webra Walters is a great spoof of the NBC journalist Barbara Walters.
Overall, this episode is very well written, and is highly recommended for anyone at any age to be introduced to this show.