Lost alum Rebecca Mader‘s sci-fi cred groweth further, with a guest-starring role on Warehouse 13.

TVLine has confirmed that the actress — who in addition to her run as nosebleed-prone Charlotte Lewis has appeared on Fringe, Alphas, No Ordinary Family and even popped up in Iron Man 3 — will appear in the Syfy series’ fifth and final, six-episode season.

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Syfy however is not divulging any details on Mader’s one-episode role, while other sources confirm that the nature of it is being closely guarded. Series lead Eddie McClintock shared a (haunting, Fringe memory-evoking) picture of Mader via Twitter.

Mader’s TV credits also include USA Network’s White Collar and Covert Affairs.

Warehouse 13‘s penultimate season finale airs July 8.

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Do you welcome Mader to the Warehouse, which previously has been frequented by one of her besties, Jamie Murray aka H.G.? Any theories on the secrecy surrounding her farewell-season role?