The Heat Is On - Written by Ciaran Murtagh and Andrew Jones  Pilbury is in the grip of a heatwave and Digby and Hacker are sent to the park to get some summer photos. Digby puts his stomach first and heads for the nearest ice-cream van. But Hacker is suspicious of the mysterious owners (who are charging £25 each for ice-cream and are claiming to be the only ice-cream men in town) and their satellite dish - just what is creating the sizzling weather? Digby and Hacker investigate! Guest Stars: Daniel Richard Wright as Mr Chillie and Steve Marsh as Mr Burr. 8 Freeze a Jolly Good Caveman - Written by Julian Dutton  Professor Krinkelhoff has discovered a frozen caveman and has transported it to Pilbury Museum. Digby pops in to have a sneaky peek, but Hacker manages to unfreeze the caveman! Chaos ensues as they are called to a local party - with one extra hairy guest! Guest Stars: Mark Perry as Professor Krinkelhoff, Hugh Clay Jones as the Caveman and Barbara Durkin as Mrs DeLacey. Fangs for the Memory - Written by Rory Clark  Digby and Selina go head-to-head in a retirement home to interview Britain's oldest man. However, finding out the secret to long life becomes complicated when Jack loses his false teeth! It's up to Hacker to retrieve them from the home's sewage system. Guest Stars: Mina Anwar as Selina Sharp and Tony Aitken as Jack. Double Digby - Written by Julian Dutton  Criminal mastermind Fingers Golightly has to return to a hotel to retrieve a priceless diamond. He disguises himself as Digby to throw the police off the scent - but things get complicated when the real Digby turns up at the hotel for an annual teddy bear convention. Guest Stars: Mina Anwar as Selina Sharp and Daniel Tatarsky as Inspector Mortlake. Down in the Mouth - Written by Ciaran Murtagh and Andrew Jones  Captain Croc's new sweetie, Grinballs, is proving irresistible to the people of Pilbury. Digby is no exception and soon ends up in the dentist's chair under the watchful eye of Dr McCavity. But Hacker unearths a massive scoop when he discovers there is more to the mysterious dentist than meets the eye. Guest Stars: James Hurn as Dr McCavity and Lesley Joseph as the Dentist Receptionist.