The actress recently reprised her role as Clare and is expected to be back on screen later this month.
Bissix told Channel 5's The Wright Stuff today (March 1): "I've been filming last week. It's good to go back and it's very, very evil.
"I have to promise you - it's extra evil! It's exciting times at the moment."
Show bosses have previously teased that Clare will be causing trouble for Mercedes McQueen (Jennifer Metcalfe) and Doctor Browning (Joseph Thompson) in her latest storyline.
Bissix is also currently busy working on a touring production of Agatha Christie play A Murder Is Announced alongside Dean Gaffney, who was recently hospitalised after a car crash.
She said: "He's fine - the crash actually happened when we were on the way back from Derby after a show. It literally happened 10 minutes after the show. But he is fine, he's still got a little scar. He had to have something like 68 stitches, but he's back on stage and loving it.
"We start a new play on the 2nd May, so we've got another play starting."
Hollyoaks airs weeknights at 6.30pm on Channel 4, with first look screenings at 7pm on E4.
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