The 42nd episode of The Sarah Jane Adventures airs on CBBC, starring Elisabeth Sladen (Doctor Who). 
Clyde and Rani wake up one morning to find that they’re apparently the only human beings left anywhere in the world. Even Sarah has vanished without a trace – even leaving her sonic lipstick – and Mr. Smith is completely inert. The power is still on, but mobile phone networks are down. Clyde wonders why cars and planes haven’t crashed everywhere they go. After nearly a day of searching, they find one other human teenager, a boy named Gavin, and more trouble than they can handle, in the form of two huge robots roaming the streets.
written by Gareth Roberts
directed by Ashley Way
music by Sam Watts / title music by Murray GoldCast: Elisabeth Sladen (Sarah Jane Smith), Daniel Anthony (Clyde Langer), Anjli Mohindra (Rani Chandra), Alexander Armstrong (Mr. Smith), Ace Bhatti (Haresh Chandra), Jocelyn Jee Esien (Carla Langer), Joe Mason (Gavin), Paul Kasey (Red Robot), Ruari Mears (Yellow Robot)
LogBook entry by Earl Green