▁throwing ▁himself ▁over board , ▁when ▁the ▁Kir by ▁wire ▁he ▁was ▁susp ended ▁from ▁broke , ▁leaving ▁him ▁only ▁able ▁to ▁walk ▁with ▁difficulty ▁for ▁several ▁weeks . ▁The ▁studio ▁work ▁was ▁scheduled ▁to ▁run ▁from ▁ 6 ▁November ▁until ▁mid ▁December ▁and ▁consisted ▁of ▁all ▁the ▁interior ▁scenes ▁and ▁those ▁in ▁the ▁T ARD IS . ▁By ▁mid - Nov ember ▁however ▁the ▁elect r icians ▁union ▁the ▁E E PT U , ▁had ▁begun ▁strike ▁action ▁which ▁dis rupted ▁the ▁film ing ▁of ▁a ▁number ▁of ▁BBC ▁produ ctions ▁including ▁En light en ment ▁and ▁potentially ▁meaning ▁the ▁final ▁three ▁serial s ▁of ▁the ▁season ▁would ▁have ▁to ▁be ▁abandoned . ▁The ▁elect r icians ▁dispute ▁was ▁settled ▁by ▁December , ▁but ▁it ▁had ▁badly ▁affected ▁the ▁series ▁recording ▁schedule . ▁The ▁crew ▁were ▁able ▁to ▁shoot ▁the ▁following ▁serial ▁The ▁King ' s ▁Dem ons ▁on ▁schedule , ▁meaning ▁that ▁there ▁was ▁only ▁one ▁recording ▁block ▁left ▁for ▁the ▁part - comple ted ▁En light en ment ▁and ▁Eric ▁Sa ward ' s ▁season ▁finale ; ▁The ▁Return . ▁ ▁With ▁some ▁film ing ▁already ▁completed , ▁and ▁its ▁importance ▁in ▁con cluding ▁the ▁Black ▁Guardian ▁story - arc , ▁it ▁was ▁decided ▁that ▁En light en ment ▁should ▁take ▁preced ence ▁and ▁so ▁it ▁had ▁its ▁second ▁production ▁block ▁moved ▁to ▁January ▁ 1 9 8 3 , ▁while ▁The ▁Return ▁was ▁abandoned . ▁ ▁Due ▁to ▁the ▁del ays , ▁the ▁serial ▁only ▁finished ▁film ing ▁around