At Comic-Con 2015, the stars and EPs previewed what’s ahead following the shocking events in the season four finale. During the panel, the executive producers revealed plans for the upcoming 100th episode, new wesen monsters for season 5, including the Loch Ness Monster, Nick and Adalind’s baby, Rosalee’s dark past, and more. Source: The Hollywood Reporter
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Greenwalt said the entire group will be tested. “This year is going to be the rise of the Wesen. Its going to be kind of revolutionary-type Wesen group that wants to wreak havoc upon every one of our beloved people,” he said.
However, there are a few positive things ahead. Hank will find love, the executive producers teased, and there will be “political opportunity” for Sean.
The executive producers also revealed some of the big plans in store for the show’s 100th episode, which is coming up this season. “We’re going to explain the damn keys,” said Greenwalt, which elicited roars from the crowd. “We still don’t know what they do but by god we’re going to explain it.”
In the line with that, Roiz said season five gets “back to a lot of the mythology of season one.”
However, Greenwalt saved one of the best season five teases for last. He said, “We’re going to do the Loch Ness monster coming up,” he said. “We’re going to explain that in the Grimm world.”