The 42nd season of the preschool educational series will focus on science, math and engineering education. "Sesame Street" will include age-appropriate experimentation; the season premiere will feature the designing of a launcher to send Hubert the Human Cannonball over a yard and into a bucket of blue gelatin.

Broadway stars who will join the puppets on the upcoming season of "Sesame Street" include Liev Schreiber (A View From the Bridge), Jesse Tyler Ferguson (On the Town), Johnny Galecki (The Little Dog Laughed), Nicole Kidman (The Blue Room), Mark Ruffalo (Awake and Sing!), Sofia Vergara (Chicago) and Robin Williams (Bengal Tiger at the Baghdad Zoo).

Other celebrity appearances will include Emma Stone, Naomi Watts, Seth Rogen, Elvis Costello, Craig Ferguson, George Lopez, Jay Sean, Bruno Mars, Carmelo Anthony and Supreme Court Justice Sonia Sotomayor, among others.

“Sesame Street” will kick off its 42nd season on PBS Sept. 26. For more information, visit www.pbs.org.