The Berenstain Bears No Girls Allowed is the 21st episode in the Berenstain Bears 1985 series.
Sister Bear used to nag the boys to let her join in their games, to their consternation. As of late she has become a better ball player as well as besting the boys at other games such as marbles. However, she has become the opposite of a sore loser, rather a "bad winner", celebrating her victories by claiming she is better than they boys. Brother, Freddy and the others are fed up with Sister's gloating. One day, Sister goes to the usual playing areas, such as the baseball diamond and playground only to see no one around. She chalks it up to the boys being sick of the usual games and wanting a break. But after three days of no playmates, she wonders if something is wrong. She goes searching for the boys, only to see them in a swamp behind the baseball diamond. She also sees what looks like a fortress and thinks it is cool, only to have Freddy bang on a pot and yell "Battle stations! Battle stations! Female approaching coming through thicket! Female approaching coming through thicket!" When Sister shows up in front of the clubhouse, she does her victory dance excited to find out about their club. In response to her gloating, Brother and the others wind up a drawbridge and unveil a sign reads "Bear Country Clubhouse: No Girls Allowed!" Sister runs away in tears, plotting revenge. Papa is furious and vows to punish Brother, but Mama suggests fixing up the old treehouse and inviting all her friends. Papa renovates the tree fort and Sister invites the girls. Sister is about to make a "No Boys Allowed" sign, but Mama says two wrongs do not make a right. Mama says Brother and the boys are wrongheaded, but Sister brought some of this on herself with her gloating. Sister and the girls grill fish to celebrate the treehouse, which gets Brother and the boys out of theirs. The girls invite the boys to their barbeque, then the boys say they found a blackberry bush in the thicket and will share it with the girls. Brother races ahead to the fortress to make a new sign: "Bear Country Clubhouse: Girls Welcome".
- Brian Cummings - Papa Bear
- Ruth Buzzi - Mama Bear, Pru, Sue, Pam
- Christina Lange - Sister Bear
- David Mendenhall - Brother Bear
- Josh Rodine - Cousin Freddy
- Zachary Danziger - Too-Tall, Bill Bunny, Benjamin Frog, Firefly
- Frank Welker - Sailor, Turtle, Smirk, Skuzz, Vinnie