ises ▁his ▁role ▁of ▁Tim othy ▁" D um ▁Dum " ▁D ug an ▁from ▁previous ▁Marvel ▁Cin ematic ▁Un iverse ▁films , ▁and ▁Chris ▁Evans ▁appears ▁as ▁Steve ▁Rog ers ▁/ ▁Captain ▁America ▁via ▁archive ▁foot age ▁from ▁The ▁First ▁Aven ger . ▁Sh ane ▁Black , ▁director ▁and ▁co - writer ▁of ▁Iron ▁Man ▁ 3 , ▁voices ▁the ▁" Dis emb od ied ▁Vo ice ", ▁the ▁caller ▁on ▁the ▁other ▁end ▁of ▁the ▁case ▁line . ▁ ▁Production ▁ ▁Development ▁In ▁August ▁ 2 0 1 1 , ▁Marvel ▁Studios ▁announced ▁that ▁a ▁couple ▁of ▁short ▁films ▁would ▁be ▁released ▁direct - to - video , ▁which ▁were ▁designed ▁to ▁be ▁self - cont ained ▁stories ▁and ▁known ▁as ▁Marvel ▁One - Sh ots . ▁Co - produ cer ▁Brad ▁W inder baum ▁said ▁" It ' s ▁a ▁fun ▁way ▁to ▁experiment ▁with ▁new ▁characters ▁and ▁ideas , ▁but ▁more ▁important ly ▁it ' s ▁a ▁way ▁for ▁us ▁to ▁expand ▁the ▁Marvel ▁Cin ematic ▁Un iverse ▁and ▁tell ▁stories ▁that ▁live ▁outside ▁the ▁plot ▁of ▁our ▁features ." ▁One ▁of ▁the ▁ideas ▁developed ▁as ▁a ▁potential ▁One - Sh ot ▁was ▁a ▁spin - off ▁from ▁Captain ▁America : ▁The ▁First ▁Aven ger , ▁following ▁the ▁story ▁of ▁Peg gy ▁Carter ▁after ▁the ▁events ▁of ▁that ▁film . ▁The ▁idea ▁was ▁looked ▁at ▁again ▁when ▁Marvel ▁was ▁dec iding ▁on ▁a ▁short ▁film ▁to ▁produce ▁for ▁the ▁home ▁media ▁release ▁of ▁Iron ▁Man ▁ 3 ▁in ▁