“High School Musical: The Musical: The Series” will reveal the fates of the original film franchise’s many characters, including Zac Efron and Vanessa Hudgens’ Troy and Gabriella.

Corbin Bleu, Monique Coleman, Lucas Grabeel and Kaycee Stroh appear in a video for "High School Reunion," a song for "High School Musical: The Musical: The Series" Season 4.

Disney has not confirmed guest appearances for either Efron or Hudgens. But Corbin Bleu, who portrayed Chad Danforth in the "High School Musical" films, is set to guest star as a fictional version ...