S1·E45 Caillou's Missing Sock
Aired November 14, 1997
Synopsis
Caillou wants to wear his favorite socks, but one of them is missing. When he goes looking in the basement he accidentally gets himself locked in. Daddy to the rescue! Only now they're both locked in! Caillou and Dad shout to attract Mom's attention. She comes and lets them out and finds the missing sock.