"Bigfoot, Littlebrain" is the first segment from the fifty-eighth episode of Timon & Pumbaa.
Pumbaa is lying down while Timon is reading a magazine. Pumbaa says that they have been doing nothing for three days. Timon sees an article about Bigfoot. Pumbaa tells his friend that Bigfoot is his hero because he is big and scary and does almost nothing just like them. The warthog suggests that he and Timon go on an adventure to find Bigfoot. Timon somewhat doesn't accept it until he sees bugs flying over Bigfoot's head.
Timon and Pumbaa find Bigfoot. As the two do so, they see rocks coming towards them and they quickly get out of the way. Timon and Pumbaa see Bigfoot's trails and follow it until Timon falls in a big foot-shaped hole. After Timon gets lifted up by Pumbaa, Bigfoot shows up and Pumbaa is happy to meet him. Bigfoot asks Timon and Pumbaa if they want to be his friends and the two agree and they eat the bugs that are flying over Bigfoot's head.
After eating the bugs, Timon and Pumbaa get ready to leave, but Bigfoot doesn't want them to because he doesn't want to be left alone since they ate the bugs, who turn out to be Bigfoot's only friends. Timon and Pumbaa are shocked to hear that and feel guilty. Timon still wants to leave but Pumbaa suggests they stay. Bigfoot has an idea for a game. He decides to play a game of "swat" and he swats Timon. Pumbaa suggests they play a different game and Bigfoot decides to play hide-and-seek. He hides Timon in a trunk of a tree and looks for the meerkat because he forgets where he hides him.
The next day when morning comes, Timon tells Pumbaa to sneakily escape Bigfoot, but Pumbaa still wants to stay with him. Bigfoot wakes up and plays two different games with Timon and Pumbaa. Pumbaa now starts to agree with Timon, saying that they should do something. Timon gets an idea, goes to Bigfoot and makes him stare at a line on the ground. Timon gets ready to leave while Bigfoot is distracted by the line, but Pumbaa suggests they find a friend for Bigfoot first.
Timon and Pumbaa go catch some bugs for Bigfoot to befriend. After doing so, the two go back to Bigfoot, still staring at the line on the ground, and try to get his attention. Then, a butterfly shows up and befriends Bigfoot. Bigfoot tells Timon and Pumbaa to leave now and walks away with the butterfly. Timon and Pumbaa are about to eat the bugs they caught, but then bees come out of the bag and chase Timon and Pumbaa.