Episode	Production	Airdate	Title	Notes
125	0601	September 21, 1989	Denise: The Saga Continues	Denise returns from Africa, with a new husband and stepdaughter in tow. Joseph C. Phillips and Raven-Symoné join the cast as Martin and Olivia Kendall. Last appearance of Peter Costa as Peter.
126	0602	September 28, 1989	Surf's Up	After recreating one of Cliff's stories, Theo and his roommates are kicked out of their apartment. First appearance of Keith Diamond as Danny. Guest appearance by Anthony Quinn.
127	0603	October 5, 1989	I'm 'In' With the 'In' Crowd	Vanessa and her friends get drunk playing a drinking game. Pam Potillo as Janet. Elizabeth Narvaez as Kara. Guest appearance by Bill Cosby's real-life daughter Ensa Cosby, upon whom the character Vanessa is loosely based.
128	0605	October 12, 1989	Denise Kendall: Navy Wife	Denise forgets to respond to a letter from the Navy and confirm that she and Martin want housing on the naval base in Rhode Island.
129	0604	October 19, 1989	Theo's Gift	Theo is diagnosed with dyslexia, a learning disability which contributed to the academic problems he has had over the years. Michelle Thomas as Justine.
130	0606	October 26, 1989	Denise Kendall: Babysitter	Denise and Olivia babysit Winnie and Nelson (Sondra and Elvin's twins).
131	0607	November 2, 1989	Shall We Dance?	Rudy and one of her classmates have a crush on each other, but peer pressure could ruin things. Guest appearance by Elaine Stritch. (Phylicia Rashād, Lisa Bonet, Joseph C. Phillips and Raven-Symoné appear on the episode of A Different World which airs later that evening.)
132	0608	November 9, 1989	The Day the Spores Landed	Cliff dreams that men worldwide have become pregnant -- including his son Theo, his sons-in-law Elvin and Martin, and himself. Voice-over by NBC News correspondent John Palmer.
133	0610	November 16, 1989	Cliff's Wet Adventure	Denise invites Martin's ex-wife Paula for Thanksgiving dinner. Clair continues to send Cliff to the store for last-minute groceries, despite the fact that it is a cold and rainy Thanksgiving Day. Victoria Rowell as Paula.
134	0609	November 30, 1989	Grampy and Nu-Nu Visit the Huxtables	Martin's parents (Olivia's grandparents) come for a visit. Actor Moses Gunn and jazz singer Nancy Wilson guest star as Martin's parents.
135	0611	December 7, 1989	Cliff la Dolce	Cliff is in charge while Clair and Denise are out of town. Guest: Elaine Stritch as Mrs, McGee
136	0612	December 14, 1989	Getting to Know You	As Christmas approaches, Cliff and Martin get to know each other better. Denise and Martin recreate their wedding ceremony, which allows Cliff to give his daughter away.
137	0613	January 4, 1990	Elvin Pays for Dinner	Elvin takes two female college friends to dinner to reminisce and Sondra becomes very upset.
138	0526	January 11, 1990	Cliff's Nightmare	Guest appearance by The Muppets (Performed by Jerry Nelson, Dave Goelz, Richard Hunt, and Kevin Clash.) Voice-over by Wallace Shawn.
139	0614	January 18, 1990	Denise Kendall: Singles Counselor	Denise causes trouble while trying to help Vanessa get a date.
140	0615	January 25, 1990	The Birthday Party	Olivia's 4th birthday.
141	0616	February 1, 1990	Not Everybody Loves the Blues	Theo thinks about proposing to Justine. Kenny, who was "born to sing the blues," gets the chance to sing with a legendary blues singer/guitarist. Deon Richmond as Kenny. Michelle Thomas as Justine. Guest appearance by B.B. King
142	0617	February 8, 1990	Rudy's Walk on the Wild Side	Rudy steals money from Clair to buy a sweatshirt (Rudy and her friend Kim do the Electric Slide). Deon Richmond as Kenny.
143	0618	February 15, 1990	Mr. Sandman	Rudy is forced to take tap dancing lessons for a school project. Cliff is presented with a "challenge" he cannot resist. Guest appearances by Howard "Sandman" Sims and Elaine Stritch.
144	0619	February 22, 1990	Isn't It Romantic?	Cliff, Elvin and Martin secretly compete to determine who is the most romantic husband in the Huxtable family.
145	0620	March 15, 1990	Theo's Dirty Laundry	Cliff and Clair discover that Theo has moved in with Justine. Last Appearance Of Michelle Thomas as Justine. Victoria Rowell as Paula.
146	0621	March 22, 1990	What's It All About?	Clair is burned out from work and family pressures and hurries off to the woods.
147	0622	April 5, 1990	Off to See the Wretched	Vanessa and her friends sneak out of town to attend a concert in Baltimore, but encounter huge problems along the way. Afterwards, she must face the wrath of Cliff and an infuriated Clair. Pam Potillo as Janet. Elizabeth Narvaez as Kara. Directed by Malcolm-Jamal Warner and Carl Lauten.
148	0623	April 19, 1990	The Moves	The Huxtables' nerdy neighbor (Wallace Shawn) reinvents himself after a divorce.
149	0624	April 26, 1990	Live and Learn	Denise wants to become a teacher . . . without finishing college. Guest appearance by Max Roach.
150	0625	May 3, 1990	The Storyteller	"Gram Tee", Cliff's 98 year old great aunt, comes to visit the family. Guest appearances by Minnie Gentry and Mavis Staples. Portions filmed at St. James Presbyterian Church in Harlem, New York City.