Viewers of the show will remember that back in series 11, Chloe and Mario enjoyed a brief secret romance, which later caused implications for Chloe's brother and Mario's best mate Charlie Sims, as well as Chloe's former friend Lauren Pope.
Fast-forward to series 12 and Chloe found love with Elliott, with the couple going from strength to strength. But with Mario's return, are things about to get awkward?
Preview pictures from the first of tonight's Ibiza special (8 October) shows Mario and Chloe come face-to-face at a bar, with ladies' man Mario questioning why Chloe has cut their friendship short.
Their encounter soon leads to Elliott getting involved and tension grows between the two alpha males.
It seems like crisis talks are also being held, as Chloe and Elliott are pictured sitting across the table from Mario and Charlie.
Can they all resolve their differences? Find out tonight!
If you want even more gossip on TOWIE's brand new 13th series, including spoilers, exclusive chats with the cast and information on the special spin-off show hosted by Mark Wright and Denise Van Outen, then click here!
TOWIE returns with The Only Way is Ibiza tonight (Wednesday 8 October) at 9pm, exclusively on ITVBe. TOWIE: All Back to Essex will air straight after at 10pm.
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Watch The Only Way is Ibiza trailer below: