From Muppet Wiki

Alphaquest was a series of Sesame Street segments combining live action and animation, in which a girl goes through a hallway and into various rooms, each one representing a different letter of the alphabet. The segments premiered in the early 1990s.

Segments

• B (EKA: Episode 3154)

• D (EKA: Episode 2754)

Dry dust dessert, drums, dance, and dinosaur.

• F (EKA: Episode 3144)

• H (EKA: Episode 2781)

Heading over the hills in a helicopter to a hippo's house.

• P (EKA: Episode 3141)

A pack of painted purple penguins practicing a pop song in a pine tree park, and a pink pig with a parachute.

• S (EKA: Episode 3368)

Seagull, silly surfer, and submarine.

Note: Grover makes a cameo in this skit as the silly surfer.

• W (EKA: Episode 3120)