Phoebe's (Lisa Kudrow) anticipated reunion with her sailor boyfriend, Ryan (guest star Charlie Sheen), is scuttled by a case of chicken pox. Despite Phoebe's condition, Ryan will not be stopped -- or will he? Meanwhile, Joey (Matt LeBlanc) applies his acting skills to a temporary job at Chandler's (Matthew Perry) office, leading to a bad case of galloping improvisation. And Monica (Courteney Cox) worries that Richard (Tom Selleck) is too perfect -- no tics, no neuroses, no obsessions. ~ Hal Erickson, Rovi