TV Guide Nickelodeon Thursday

Smurfette and Grouchy compete to decide who is the best in 'The Battle of the Sitters', and in 'Let's Smurf To Mars', Blossom dreams of going to Mars and can count on her friends to help. (S3, ep 11)

Handy has invented a machine that allows him to understand animals in 'What the bear said', then in 'Parallel Worlds', Clumsy and Dimwitty open up a portal with other worlds. (S3, ep 12)

Eleanor decides to move in with Alvin and his brothers in 'Sister Act', then in 'Lil' T', Theodore posts a video of himself rapping on the Internet and it becomes a mega-hit! (S1, ep 3)

At the end of the second series of the computer-animated adventures of the wise-cracking blue hedgehog, Tails' doppelganger Nine (voiced by Ashleigh Ball) stole the Prism Shards to create a new reality, consigning Sonic (voiced by Deven Mack) and Shadow (Ian Hanlin) to a grim fate. Spiny mammals rally in these eight action-packed episodes, which force former enemies to forge alliances and restore stability to a mouldering Shatterverse. If Sonic is going to restore his reality in Green Hill, he will need to place his trust in friends Amy Rose (Shannon Chan-Kent), Knuckles (Adam Nurada) and Rouge (Kazumi Evans) as well as scientist Dr Eggman (Brian Drummond)

Alvin and Simon have a secret club in 'Mysterions', and in 'The Crow That Ate My Homework', Dave promises to take Alvin to a park if he gets a good grade on his test, but a crow steals it. (S4, ep 4)

Our trio go on an unnecessarily action-packed adventure in 'Key Limes', then in 'Six Pieces of Turkey', after Rock's TV dinner isn't as plentiful as advertised, he fights for justice.

Mr. Krabs finds pets are profitable in 'A Place for Pets', then in 'Lockdown for Love', Plankton ruins another date with Karen, so she puts the Chum Bucket on lockdown until he proves his affection.