Rachel (Jennifer Aniston) volunteers to monkey-sit Marcel -- who promptly escapes. The thrill of chasing Marcel down arouses something in Ross (David Schwimmer), who makes his move on Rachel. Alas, this cozy tête-à-tête is ruined by the untimely arrival of Rachel's ex-fiancé, the former Mr. Potato Head (aka Barry Farber [Mitchell Whitfield]). The denouement hinges on a tense showdown with the eccentric Mr. Heckles (Larry Hankin) and trigger-happy animal catcher Luisa (Megan Cavanagh). ~ Hal Erickson, Rovi