You won't see him, but you'll be able to hear him. And you'll guess right away Who it is.

Roger Daltrey, the lead singer and founder of the rock band The Who, is slated to guest appear on a March episode of ABC's "Once Upon a Time."

Daltrey will do the voice of the Caterpillar in an episode themed around "Alice in Wonderland." It's almost poetic justice to have him a part of the show, according to Entertainment Weekly, since "Once" executive producers Edward Kitsis and Adam Horowitz said it was "Tommy," the 1975 rock opera from The Who, which played a primary role in inspiring "Once Upon a Time" in the first place.

Daltrey may be known for his voice, but he's no stranger to television and film. The 67-year-old has appeared in a number of productions beginning in the 1970s like the short-lived British series "Buddy" in 1986, "Tales from the Crypt," "Lois & Clark," "Sliders," "Highlander," "Witchblade" and others.

His most recent television appearance, according to Internet Movie Database, was at the 2010 Super Bowl halftime show performing with The Who. Before that, he played Mick Keating in an episode of Britain's "The Last Detective" in 2007 with former "Doctor Who" star Peter Davison.

"Once" has been looking for some bigger names to fill roles in the show, to help it maintain momentum it has on Sundays for ABC. Just last week, Barbara Hershey was cast as the Evil Queen's mother.

"Once" is averaging a 6.1 rating/9 share in Fast National overnight ratings from The Nielsen Co., by far ABC's best program on Sundays, but behind both "The Good Wife" and "CSI: Miami" on CBS in the drama department. It's improved its timeslot for ABC by almost 20 percent, and is ABC's No. 5 show through the end of January. It's behind "Dancing With the Stars" (10.6/16), "Modern Family" (7.8/12), "Castle" (7.3/12) and "Grey's Anatomy" (6.7/10).

It sits just outside the top 30 overall.

"Once Upon a Time" airs Sundays at 8 p.m. ET on ABC.