You can use them individually, or as a mob. A mob of four S.H.I.E.L.D. agents isn't a 4d mob, however; it's more like a 2d mob, a handful of minor characters. Because of this it may be easier to continue to treat them as individuals and just assign them one or two at a time. They can support the hero with dice just like any other character can. The hero can spend PP on them rather than have them use doom dice.
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