The Wonder Years guest stars Malcolm-Jamal Warner and Patti LaBelle are appearing in Wednesday night’s one-hour, season 2 finale.

Warner plays Melvin, Bill’s (Dule Hill) older, more successful brother who appears to be the favorite child of their father, Clisby (previous guest star Richard Gant). LaBelle plays Bill and Melvin’s mother, who only wants the best for both of her children.

The Season 2 finale is comprised of two 30-minute episodes starting at 9 pm ET/8 pm CT, “Happy Birthday Clisby” and “The Happiest Place on Earth.” The first episode focuses on Clisby’s birthday and the second sees the Williams family take a trip to Disneyland. Here’s more about each episode.

9:00-9:30 p.m. EDT – The Wonder Years: “Happy Birthday Clisby”

The Williams gather to celebrate Clisby’s 75th birthday – including Bill’s brother Melvin and his daughter Cassie. While Bill and Melvin try to one-up each other for Clisby’s approval, Cassie shares big news with Lillian and Kim.

9:30-10:00 p.m. EDT – The Wonder Years: “The Happiest Place on Earth”

When the Williams family decides to go on a family vacation, Kim suggests a road trip to Austin College and Dean proposes a stop at Disneyland. After meeting up with his old bandmates, Bill reflects on his life choices.

Check out the exclusive clip from “Happy Birthday Clisby” below.