According to Blastr.com, in the two-hour season finale of WAREHOUSE 13 Emily Lake:
“Pete, Myka, Artie and Claudia race to stop the murderous Walter Sykes (Anthony Michael Hall) to save the Warehouse and the world. Meanwhile, Sykes’ final revenge involves recruiting H.G. Wells (Jaime Murray).”
They also confirm that WAREHOUSE 13 has been picked up for a fourth season, which they say “will likely premiere next summer”.