Dissolution - S2-E6
Trivia: When Daisy bangs on the window in Marsha's room and shouts for Colin, he looks round. However, he looks directly behind him rather than up where Daisy is, at the second floor window. This incident led to Nick Frost theorising that dogs can't look up, which inspired the running gag in the film 'Shaun Of The Dead', a movie created by Spaced director Edgar Wright and star Simon Pegg, starring Pegg and Nick Frost.