After Susan Kennedy (played by Jackie Woodburne) ended up in hospital with an unknown illness, Finn (Rob Mills) was left to pick up the pieces, immediately jumping into the role of acting headmaster of Erinsborough High School.
Already suspicious of her ex, Elly (Jodi Anasta) confronted Finn on what he was doing.
However nothing slips past the trickster, and he revealed that he is out to sabotage her career at all costs.
A teaser for tomorrow's episode shows things are only going to get worse as Finn's reign of terror continues.
Finn threatened to sabotage Elly's career
Will Elly go to desperate lengths to bring down evil Finn?
He puts his own agenda before anyone else
Telling the school that their head-teacher has multiple sclerosis, it seems that not only is he acting like a dictator, but Finn is on a power trip.
With Elly looking desperate to stop the evil teacher, will she turn to drastic measures and do something she might regret?
This comes as Jackie Woodburne revealed that Finn is about to endanger one of his pupils, Xanthe Canning (Lilly Van der Meer).
The 61-year-old exclusively told Express.co.uk: "He is going to take her to places that are very dangerous to her.
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With Susan in hospital, is Finn unstoppable now? Neighbours kids then & now Fri, January 20, 2017
Neighbours stars then and now. Take a look at what kids from Erinsborough High did next.
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Libby Kennedy – Kym Valentine left Ramsay Street in 2008 and recently gave birth to her second child
"He oversteps his boundaries and he convinces her to go somewhere with him and without her family knowing where she is.
"He puts his own agenda before anyone else," Jackie teased.
Neighbours continues tomorrow on Channel 5 at 1.45pm.