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An earlier paper introduced an action for a new kind of irreducible massivesuperspin one half multiplet, using BRST cohomological techniques including`BRST Recycling'. A mass term was introduced in the earlier paper. A secondmass term is discussed in this paper. This new mass invariant is an`Extraordinary Invariant'--it has Zinn sources in it. The natural treatment forthis situation is to `Complete the Action' so that the new action yields zerofor the BRST Poisson Bracket. In the present case, this Completion meets a BRSTObstruction. Setting the coefficient of this `Completion Obstruction' to zerorestores the massive superspin one half supermultiplet with a new mass madefrom the two mass terms. Usually an Obstruction appears as an Anomaly at oneloop perturbation theory, but this is a different mechanism to produce it.

An Extraordinary Mass Invariant and an Obstruction in a Massive Superspin One Half Model made with a Chiral Dotted Spinor Superfield