Ep 8. World Wide Wabbit

In the episode "World Wide Wabbit" of Foster's Home for Imaginary Friends season 1, Mac and Bloo are looking for a new friend to bring back to the house. They stumble upon a website that claims to have the world's best imaginary friends for sale, and they decide to purchase one. However, when their new friend arrives, they quickly realize that he is far from perfect.

The new friend is a rabbit named Mister Bigglesworth who loves bananas and has a mischievous streak. At first, Mac and Bloo are thrilled to have a new friend who is so playful, but soon Mister Bigglesworth's pranks start to get out of hand. He steals things from around the house, breaks things, and even leads Mac and Bloo on a wild chase through the streets of the city.

Meanwhile, the rest of the friends at Foster's Home are getting worried about Mac and Bloo. They decide to launch their own investigation into Mister Bigglesworth and his origins. They discover that the website they bought him from is actually a front for an underground imaginary friend trafficking network. The website owner is using stolen or abandoned imaginary friends to make a profit, and Mister Bigglesworth is just one of the many innocent creatures being bought and sold.

Horrified by what they've discovered, the Foster's Home crew decides to take action. They track down the website owner and confront him, demanding that he stop his immoral business practices. The website owner is initially resistant, but when he sees how much the imaginary friends at Foster's Home care for one another, he has a change of heart. He agrees to shut down his website and release all of the imaginary friends he's been keeping captive.

In the end, Mac and Bloo learn an important lesson about what it means to be a true friend. Mister Bigglesworth may have been fun and exciting, but he was also causing harm to others. Real friendship means caring about each other's wellbeing and always striving to do the right thing. And with this newfound wisdom, the Foster's Home friends continue on their adventures, always looking out for each other along the way.