▁on ▁his ▁face . ▁When ▁the ▁band ages ▁were ▁removed , ▁the ▁other ▁characters ▁claimed ▁not ▁to ▁notice ▁any ▁difference . ▁A ▁similar ▁set ▁up ▁g ag ▁was ▁used ▁with ▁the ▁character ▁of ▁Herr ▁F lick ▁in ▁the ▁BBC ▁sit com ▁Al lo ▁Al lo . ▁ ▁Ret con ning ▁also ▁diff ers ▁from ▁direct ▁revision . ▁For ▁example , ▁when ▁George ▁Lucas ▁re - ed ited ▁the ▁original ▁Star ▁Wars ▁tr il ogy , ▁he ▁made ▁changes ▁directly ▁to ▁the ▁source ▁material , ▁rather ▁than ▁introdu cing ▁new ▁source ▁material ▁that ▁contrad icted ▁the ▁contents ▁of ▁previous ▁material . ▁ ▁Ret con ning ▁is ▁not ▁the ▁same ▁as ▁a ▁reboot ▁or ▁re im ag ining ▁which ▁completely ▁disc ards ▁the ▁original ▁tim eline , ▁such ▁as ▁in ▁Batt l est ar ▁Gal act ica . ▁However , ▁there ▁have ▁been ▁partial ▁re bo ots ▁of ▁franch ises ▁where ▁the ▁core ▁of ▁the ▁franch ise ▁is ▁still ▁canonical ▁but ▁the ▁expanded ▁universe ▁is ▁re leg ated ▁to ▁a ▁secondary ▁continu ity ▁which , ▁while ▁not ▁completely ▁invalid , ▁is ▁subject ▁to ▁revision ▁and ▁critical ▁review . ▁Rob ote ch ▁is ▁an ▁example ▁of ▁this . ▁With ▁the ▁release ▁of ▁the ▁ 2 0 0 6 ▁sequ el ▁film ▁Rob ote ch ▁The ▁Sh adow ▁Chron icles , ▁Harm ony ▁Gold ▁established ▁that ▁only ▁the ▁original ▁ 1 9 8 5 ▁animated ▁series ▁and ▁the ▁ 2 0 0 6 ▁sequ el ▁film ▁are ▁considered ▁canonical ▁re leg ating ▁the ▁ab orted ▁Rob ote