-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001031833-08-000048.txt : 20080423
<SEC-HEADER>0001031833-08-000048.hdr.sgml : 20080423
<ACCEPTANCE-DATETIME>20080423171240
ACCESSION NUMBER:		0001031833-08-000048
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080421
FILED AS OF DATE:		20080423
DATE AS OF CHANGE:		20080423

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Sirangelo Mark N
		CENTRAL INDEX KEY:			0001347606

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-28947
		FILM NUMBER:		08772398

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		858-375-2015

	MAIL ADDRESS:	
		STREET 1:		13855 STOWE DRIVE
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SPACEDEV, INC.
		CENTRAL INDEX KEY:			0001031833
		STANDARD INDUSTRIAL CLASSIFICATION:	GUIDED MISSILES & SPACE VEHICLES & PARTS [3760]
		IRS NUMBER:				841374613
		STATE OF INCORPORATION:			CO
		FISCAL YEAR END:			1109

	BUSINESS ADDRESS:	
		STREET 1:		13855 STOWE DRIVE
		STREET 2:		PO BOX 2121
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064
		BUSINESS PHONE:		8583752000

	MAIL ADDRESS:	
		STREET 1:		13855 STOWE DRIVE
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SPACEDEV INC
		DATE OF NAME CHANGE:	19991118

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PEGASUS DEVELOPMENT GROUP INC
		DATE OF NAME CHANGE:	19980605
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-04-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001031833</issuerCik>
        <issuerName>SPACEDEV, INC.</issuerName>
        <issuerTradingSymbol>SPDV</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001347606</rptOwnerCik>
            <rptOwnerName>Sirangelo Mark N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>13855 STOWE DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>POWAY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92064</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>NON STATUTORY STOCK OPTION</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.64</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-04-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>843750</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.64</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2012-04-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>843750</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2743750</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>INCENTIVE STOCK OPTION</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.64</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-04-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>156250</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.64</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2012-04-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>156250</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2900000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Vesting of these options are subject to the achievement of certain performance objectives as defined in the Addendum to the Executive Employment Agreement between the Company and Mr. Sirangelo. The Addendum is attached as an exhibit to the Company,s Form 8-K filed April 23, 2008.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Mark N. Sirangelo</signatureName>
        <signatureDate>2008-04-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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