Kimberly Wyatt from Taking the Next Step is flushed in to the studio to join Hacker and the team for more weird and wonderful TV. Also, there is a mutiny on board when we take to the seas with Admiral Lawnmower and his crew.

Leona Vaughan and Louis Payne from CBBC's Wolfblood find themselves flushed in to Hacker's basement studio to take part in the chaos. There's another adventure with Admiral Lawnmower and his crew, and more Lost and Found. (...& Lost Again).

One of the presenters of CBBC's The Dengineers drops in to join Hacker and the team. Also, pirates board the ship in Admiral Lawnmower's adventure and Leia sings about her obsession with Luke in Lost and Found (...& Lost Again).

Showbiz reporter Alison Hammond gets flushed in to the Hacker Time studio to star in this episode. More used to mingling with Hollywood A-Listers, how will Alison get on when she is stuck with Hacker and his hopeless crew? There's also another adventure with Admiral Lawnmower and his crew, where they are having trouble with their Sat Nav. Also, Cel Spellman joins Hacker for another song in Lost and Found (...& Lost Again). All that and Accordion George plays Beam My Guest.

Isabel Clifton and Matthew Ashforde, who play Hetty and Mr Cranbourne, are Hacker's guests. Look out for Hacker's homage to Hetty Feather and his song all about the harrowing past. Also, X marks the spot when Admiral Lawnmower and his crew reach their final destination.

BBC Breakfast and Pocket Money Pitch presenter Steph McGovern drops in to the Hacker Time studio to endure Hacker's jokes about money. Pocket Money Pitch becomes Pocket Money Pooch for one day only, plus there's a trip to Rearend-On-Sea for TV's least informative documentary, The Accommodation Place.

Hacker tricks Emmerdale actress Michelle Hardwick into the studio to endure lots of soap jokes, as well as perform in a sketch entitled Emmerfail. Plus Cel Spellman stars in Lost and Found (...& Lost Again) and there's another trip to The Accommodation Place.

Great British Bake Off finalist Luis Troyano joins Hacker, Derek, Lolly, Wilf, Herman, Larry and whoever the other ones are. Expect plenty of cake jokes, some of them funny! Plus Cel Spellman stars in Lost and Found (...& Lost Again) and another trip to The Accommodation Place.

Expect antique jokes and jokes about antiques as Paul Martin from Flog It! joins Hacker in the studio. Plus Cel Spellman appears in Lost and Found (...& Lost Again) and Simon Lowe and Su Pollard feature in another edition of The Accommodation Place.

CBBC's Art Ninja, Ricky Martin, joins Hacker in the studio for a show about all things art. Plus Luke and Leia sing about their potent breath in Lost and Found (...& Lost Again) and there's a final trip to Rearend-On-Sea for The Accommodation Place.