TheStreet's Dan Dicker and Jim Cramer discuss the fuel cell sector's incredible trading action this week and whether the rallies in these shares are sustainable and worthy of investment. Share prices in Plug Power, Ballard Systems and FuelCell Energy have seen shocking gains in the last week; all after PLUG announced a relatively small purchase of 1700 units for the distribution centers for Wal-Mart this week. PLUG, BLDP and FCEL have become nothing more than "casino stocks," according to Dicker.

At the time of publication, Cramer was long ___.

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