Felix and Poindexter travel back in time to a medieval castle, where they encounter the Professor and Rock Bottom. The Professor, posing as a wizard, and Rock Bottom, as Sir Rock, scheme to steal Felix's Magic Bag of Tricks.

Felix and Poindexter visit a ranch owned by Bart, where they encounter a giant bear named Big Brownie. Bart devises a plan to use a beehive full of honey as a trap to lure Big Brownie away. Poindexter, considering Big Brownie a friend, warns him about the trap.

Felix discovers a gold nugget in the Arctic and suggests splitting it three ways with the Professor and Rock Bottom. However, they later realize the nugget is a "Genuine Imitation Gold Nugget," worth only a bowl of soup at the Gold Prospectors café, which they share among themselves.

Big Brownie is a 1960 episode in the Trans-Lux Felix the Cat series for television, as directed & Produced by Joe Oriolo.It is the first of the three with Rancher Bart and Big Brownie, together with "Felix and Poindexter Out West" and "Out West with Big Brownie". One day, at the Professor's lab with Felix and Poindexter, Felix's just got a letter from racnher Mr.Bart, meaning Felix can no longer babysit, so he has to get to bed early and get ready. However, that night, as the cat gets ready, guess who sneaks into the suitcase, Poindexter, despite real life hazards of this. Soon, at the ranch, Felix is with Bart, who tells "tale tells" to Felix of big grizzly bear, "Big Brownie", who's been storming the ranch, raging thru tree.