Professor Callum

Professor Callum was a character in "Callum: The Show". He was portrayed as being the smart one out of all the main characters.

Professor Callum likes to keep himself occupied with work. He also likes to fix electronics and invent things.

Professor Callum was often the go-to character on the show whenever there's a technical or scientific problem there to solve.

In "That One Flashback episode" it shows that he first met the others when he attended Callum School. Specifically he met Callum first and then the two jumped in to help Hedgehog Man after he was seen being bullied by Bully Callum. The two both then befriended Hedgehog Man and Bill Callum after forcing Bully Callum to leave when they confronted him.

In Season 5 Episode 1, a Flashforward is shown of him writing to someone for help as he "has nothing left", implying something will happen later on in the season to get to this point.

In Season 5 Episode 3 "The Melancholy of Professor Callum", he reveals to Hedgehog Man that he was offered an apprenticeship a few years ago after taking a short science course in the summer after he left Callum School and he tells him he rejected the offer because his "friends mattered more" to him. Professor Callum then goes on to tell Hedgehog Man "Sometimes life changes and you can't stop it. You just gotta find your own." implying his mind has changed since then.

Hedgehog Man catches onto this and asks him "You're not leaving, are you?" then Professor Callum goes on to smile briefly then changes the subject.

In the next episode (and his final one), he comes clean about his intentions and tells Bill Callum, Hedgehog Man & Matthew that he is leaving town for good to pursue his future career. He leaves on a train the following morning, returning the amount of five Callums, to a lonelier four.