I haven't watched all of the new season yet, but I know that the Graboids from Tremors, or something akin to the Dune Worms, were originally slated to be in Fallout and Fallout 2 but were cut (I'd guess for technical reasons).
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"It's 106 miles to Arroyo, we've got a full fusion cell, half a pack of RadAway,
it's midnight, and I'm wearing a 50 year old Vault 13 jumpsuit. Let's hit it."